Here's some new answers to questions some may have...
How much does the Remake edition of HeroQuest cost?Answered:Prices vary, but the Pledge versions had two price points: Heroic Tier (Game System plus bonus box of exclusive heroes & Sir Ragnar): $99.99 plus shipping; and Mythic Tier (Heroic Tier + Box of "unlocks," plus Kellar's Keep, plus Return of the Witch Lord): $149.99 plus shipping. The Game System in retail was given a MSRP of $124.99, but this was later raised to $134.99 (in conjunction with the re-designed box). Kellar's Keep and Return of the Witch Lord in retail were given the MSRP of $24.99 each, which was then raised to $34.99. The Frozen Horror and Mage of the Mirror each retailed with a MSRP of $44.99. Hero Collection: Commander of the Guardian Knights was given a limited release with an MSRP of $14.99 (but is now sold by scalpers at a much higher price). The Knight was also offered briefly in Canada bundled with the Game System through their Gamestop stores. Hero Collection: Rogue Heir of Elethorn was released into retail (not limited this time) with a MSRP of $16.99. Lately Amazon has been selling them for much less ($100 GS, $25-28 KK/ROTWL, $38 FH, etc) except for the two newest products (MOTM and Rogue). New HeroQuest Game Systems have also been spotted for sale at or below MSRP in various local game/hobby shops around the world. Instead of offering localisations with different rules, the remake editions have been translated into other languages (with varying degrees of quality) for release in other countries outside of North America and the UK.
How does the Retail version of HeroQuest remake (2021) differ from the pledge versions?Answered: 
The retail versions (including expansions) each come with a small flier that advertises the HeroQuest Companion App, with a printed QR code to download it onto a smart phone or similar device.

The Pledge Version (Heroic Tier and Mythic) included a small box that had a red figure for prisoner Sir Rangar as well as a female Barbarian, female Wizard, female Dwarf and male Elf, as well as hero cards for each of the four hero variants (same stats as their counterparts in the main big box). The retail version lacks these extra figures. Please note, that the female Barbarian included in the Frozen Horror remake box, and the male Elf included in the Mage of the Mirror remake box are each different sculpts than the sex swapped variants found in the pledge version's bonus box.

The Pledge version in the Mythic Tier included not only the above, but also Kellar's Keep and Return of the Witch Lord. These have each been released separately in retail versions with a slight improvement. The Mythic versions had single sided tile sheets... on the opposite side of the art it was simply plain, unfinished white card, while the retail versions feature black backing with the same linen finish as the front. This makes the tiles stand out in either case from the Game System tiles when sorting and returning them to the boxes after play, presumably.

The Pledge version in the Mythic Tier also included a box of "unlocks" including: Three brand new quest books (which make use of the new artifacts): "Prophecy of Telor" (13 quests by Stephen Baker), "The Spirit Queen's Torment" (14 quests by Teos Abadia; these incorporate the Bard hero in a unique way), and "The Crypt of Perpetual Darkness" (10 quests by Joe Mangianello, which incorporate the Dragon as well as the unique tiles). These have not been re-released in retail.

Also included is a unique tile-sheet with several tiles that are the same on both sides, including acid traps and vine traps as well as a large "tavern" room that flips over to form a dragon altar room. As far as plastic miniatures, included are, a variant goblin with metal claws (2x), a variant Orc with a hammer (2x), a variant female zombie with a knife (2x), a variant female mummy (2x), a variant female Dread Warrior with a sword and shield (2x), a variant female Abomination with no weapon (2x), a variant Gargoyle with no weapon (1x), a variant female Dread Sorcerer (1x), a Dragon (1x), an alternate Wizard figure as "Mentor" with accompanying hero card (same stats as Wizard), an undead color coded "Witch Lord" figure with a staff, a female "Druid" hero with accompanying hero card and three unique spell cards, a female halfing "Warlock" hero with accompanying hero card and three unique spell cards, a male Orc "Bard" hero with accompanying hero card and three unique spell cards. An extra "dagger" equipment card (meant for the Druid), a "wand" equipment card (meant for the Warlock) and a "rapier" equipment card (meant for the Bard) is also included, along with a few extra Artifact cards (used with the dragon figure in "the Crypt of Perpetual Darkness") including the Crown of Shadows and Dragon Spear.

While the three additional heroes (Druid, Warlock, Bard) have not been re-released in retail, all three are included in all their aspects (including their unique weapons and spells) within the official HeroQuest Companion App (a free program available on the Apple App store for iOS users and the Googleplay store for Android users, but is also usable on the pc via emulation, unofficially of course). Please note that none of the Mythic exclusive quest books are part of the Companion App. The Companion App is also missing a free online quest that was released during the pledge campaign (which is still discoverable online) "Rogar's Hall" by Stephen Baker (which makes use of the "Mentor" Wizard alternate from the pledge versions). The Companion App prompts the player to use the Sir Ragnar and Witch Lord figures (if available) or else to use the Dread Sorcerer figure if they are not.

While the Pledge Mythic version includes several new artifacts, SOME of them are included in the retail Game System box, namely the Rod of Telekinesis, the Phantom Blade, the Ring of Fortitude and Fortune's Longsword (but NOT the Dragon Spear or Crown of Shadows).
Summarize the build quality and stylistic differences between the remake and classic (or vintage) editions of HeroQuest?Answered: 
First, the remake editions use the North American (US) editions of HeroQuest and its expansions as a base to build from, but a few assets from the European editions have been re-incorporated (Equipment Deck, plus some armor, weapons and other items).

Many terms have been modified to remove references to Warhammer Fantasy world lore (property of GamesWorkShop) such as "Dread" replacing "Chaos," some place names and many other minor things. Zargon is referred to in more generic, gender-neutral terms and in artwork it is strongly reinforced that the white bearded man in the red cape is Mentor, not Zargon. Some lore text about the Orcs has been tone down to imply they aren't all such evil savages (however this is restored in the free quest "New Beginnings") and direct references to slavery (of Goblins and Dread Warriors) have been removed (artwork remains showing goblins wearing broken shackles or chains).

Dice are largely, now having "sharp" corners and are entirely plastic (with the movement dice having white instead of gold pips).

The miniatures are all pre-assembled and glued instead of being on sprues and are made of a more "bendy" type of plastic with a slightly larger scale, having round bases intended for 1 inch squares. Minis are held inside black plastic vacuformed "candy trays. The original 1989 edition of HeroQuest had a similar style of plastic tray but it was only to protect the bottom of the box and hold the cards... while the North American version included small cardboard trays to organize pieces or serve as dice rolling boxes.

The board is larger and uses 1x1 inch squares with the HeroQuest Logo appearing on the right edge instead of the bottom. It is a quad-fold that has linen finish.

Tiles are larger and have a linen finish similar to the cards and board. The box itself has a much less pronounced linen texture to it (Mage of the Mirror's box has a more pronounced linen finish that makes it much easier to open than the other boxes).

The character sheets are slightly larger and on thicker paper.

The quest book and rulebook are on glossy (or satiny) finish paper in full color and decorated with much of the new artwork which is re-painted from the old Gary Chalke illustrations, Les Edwards paintings and Warhammer inspired artwork of the original versions in a new more "modern" (and less realistic) fantasy style. Instead of being held together with staples they are stitched with thread. Expansion quest books now include a blank quest map at the end with symbols, similar to the game system quest book.

Furniture is mostly the same size (sometimes smaller) but made entirely of plastic sculpted in gray or brown.

Cards are now larger (Poker Size) with linen style finish and redone artwork inspired by the originals. The cardboard "Hero Tiles" are replaced with standard size hero cards, along with "turn cards" that explain what actions can be done on a Hero's turn (formerly this information was on the back of the hero tile).

Potions and other items are now put on "Equipment" cards. The extra Artifacts from Kellar's Keep and Return of the Witch Lord are full size, but each quest book other than the game system one include pictures of the extra item cards at the beginning and end pages for reference and are not meant to be cut out (but permission is given to photocopy or scan and print images for the purposes of making your own quests).
What New assets are included in the remake retail version that were not present in any previous vintage edition of HeroQuest?Answered: 
The Fimir has been completely replaced with another green monster known as the "Abomination" with the exact same stats.

New Artifacts are included: The Rod of Telekinesis, Ring of Fortitude, Phantom Blade and Fortune's Longsword. These are only found in the Mythic tier quest books, so you will have to homebrew their use if you purchased in retail.

Various tiles now have alternate artwork on the back (instead of just being all black): Spiral Staircase (vertical staircase), Double Blocked Squares (Sewer grates).

The Equipment deck was ported over from the EU edition (replacing the Armory board) with the addition of a card (several copies) of the Longsword as well as the dagger equipments. Additionally, the Hand Axe and Bracers were ported over from the EU edition with modifications (due to an accidental text omission, the Wizard is able to use the Hand axe weapon).

The Holy Water and Potion of Speed were taken from the EU treasure deck and turned into purchasable equipment.

A "mystery tile" with no explained function, showing the Mentor and Zargon symbols on alternate sides. It is finally used in the free online quest "Into the Northlands" (also featured in the Companion App).
Is there a new version of the retail Game System?Answered: Yes!The original retail version came out shortly after the pledge versions were delivered (though most didn't become available until early 2022). It was virtually the same as the version that pledgers got though some commented that the quality control was slightly better (fewer complaints about poorly glued or broken figures, poorly inscribed combat dice). Later a second edition was released which used a slimmer box, and in response to complaints that the plastic "candy trays" that held the miniatures were very snug and tight now hold the figures much more loosely making them far easier to remove and pack up again. To keep the figures from falling out, there is now a transparent plastic form cover(s) that fits over the top of the trays. Much of the original box was empty space (including a space filler white cardboard form in the bottom... which could be removed along with the "candy trays" and cardboard slip covers of the cover art to re-package the mythic assets into one box) and it is more compact now.
What new assets appear in the remakes of the expansions?Answered: 
The Alchemist Shop potions from the various expansions now appear in those boxes as "Equipment" cards (cards do not limit stock for these items as with any Equipment).

The "iron entrance door" (formerly the steel door) and "wooden exit door" are dedicated plastic miniatures fully sculpted now instead of being cardboard insert alternates for the regular door bases as in the legacy versions. KK & ROTWL use the same sculpts for these but MOTM and FH remakes use unique sculpts (and the FH ones are in pastel blue).

Kellar's Keep and Return of the Witch Lord each include a "mystery tile" with no explained use... a "mummy statue" and a "bone pile."

The Commander of the Guardian Knights hero was sold for a limited time as an exclusive through stores like Gamestop, but the character is included within the Companion App (though none of his Skill cards are actually shown). Avalon Hill has confirmed that a re-sculpted version (with the same stats) of this character will appear in the upcoming Rise of the Dread Moon expansion (which is otherwise a completely new adventure pack, not directly based on any previous legacy HeroQuest product). The original "Hero Collection" included male and female variants of the character with their own hero cards (same stats) as well as each having a copy of the shortsword and shield equipment cards (same mechanics but variant artwork from the Game System) as well as each having a set of the same three "skill" cards. A brief story "parchment" is included which gives lore background but does not give specific instructions on how to actually use the hero (similar to the lack of guidance given on the Warlock and Druid in the Mythic box).

The Frozen Horror (formerly "Barbarian Quest Pack: The Frozen Horror") remake includes an alternate set of Combat dice (transparent blue with white inscribed symbols) and movement dice (dark blue with white pips). There are double the number of mercenaries (due to the lack of removable weapons on the unique sculpts for each type) for a total of 12 and an equal number of each armament. There seem to be a few extra skull/single blocked square tiles included.

The Mage of the Mirror (formerly "Elf Quest Pack / Quest Pack for the Elf: the Mage of the Mirror" includes several pieces of alternate sculpted furniture: one Fireplace, three Treasure Chests, four Portcullis, two bookcases, one cupboard, one throne, one weapons rack, one tomb, one alchemist bench, two mirror stands (looks similar to the vintage HeroQuest door bases in a different type of plastic). Also instead of the blue plastic alternate female hero, there is a red male elf hero (different from the pledge version, this one is based directly on the 1992 cover artwork of the original Elf Quest Pack with an accompanying hero card, same stats as the previous elves). Extra monsters are included: alternate female Elven archers (2x), alternate female Elven warriors (2x). The new tomb is larger than the old one and again has a removable lid but still too small to truly hide a character miniature. The Ogres are now in basic gray instead of dark blue. There seem to be a few extra skull/single blocked square tiles included.

The Mage of the Mirror also incorporates playtesting fixes and adjustments to the original 1992 edition within the quest book itself. For example the original version included several unmarked treasure chests, that have been given gold rewards and the "Elven Bracers" artifact is now found in one of them early on as well. A new section explains that any completely unmarked treasure chests automatically contain 200 gold coins for the first searcher (although there are none in the actual campaign) and another says that if mercenaries are owned in another expansion they can be hired in group quests in this pack as well. The section explaining that only one Elf can be used in a party at a time has been removed completely. The Ogre monster card has had its body points reduced from 10 to only 5. As with other editions, there have been some name changes, though this time they are a little more inexplicable not seeming to refer to things in the Warhammer Fantasy world as with previous remake installments.

"Online Quests" have been released for free on the internet and also with the Companion App (other than "Rogar's Hall" which is missing from the App) including "New Beginnings" which incorporates some of the rules of EQP/BQP into the Game System as an introduction before or in place of The Trial; The Forsaken Tunnels of Xor Xel meant as a bridge between the end of the Game System and the beginning of Kellar's Keep (but seems to assume you also own Return of the Witch Lord with its emphasis on Undead monsters); and "Into the Northlands" a solo quest (for any hero) meant as a prelude to the Frozen Horror (and uses assets from that quest pack).
What does the future of HeroQuest hold?Answered:The failure of HeroScape: Age of Annihilation to fund, layoffs at Hasbro, and the PR debacle over the recent D&D OGL update (which was retracted, originally part of the One D&D/D&D Beyond project) have all caused some of us to be concerned for the future of HeroQuest, but we were given assurances that none of this is expected to hinder their efforts to keep creating new HeroQuest content or continuing to sell the product into the future.
Via Twitter and Discord, Avalon Hill's Chris Nadeau (aka Encarmine) has confirmed that the company has plans for HeroQuest going at least through 2026. It has been confirmed that the next large expansion will be titled "Rise of the Dread Moon" and will tie directly in with Mage of the Mirror (as a sequel or prequel). It will see the return of the Guardian Knight hero (in a different form, now wearing a helmet but with the same stats as in the limited release) but otherwise will be a wholly original creation rather than a remake of a legacy product. It is assumed that this expansion will be similar in size and scope to Mage of the Mirror and the Frozen Horror. It will feature the return of another "guest star" but other details are sketchy at this time other than some cover art. It is expected to release sometime this year (2023). It has virtually been confirmed that Avalon Hill plans to remake the European exclusive expansions (including Against the Ogre Horde and Wizards of Morcar, perhaps also the Dark Company). Additionally when discussions were being had about the unreleased Dwarf and Wizard quest packs (of which leaked draft notes have appeared in various places) Encarmine confirmed that Hasbro "has all the assets" from these unfinished projects, implying perhaps there are plans to finish and release them at some point.
While not confirmed, there has been positive talk about "looking into" Battle Masters (from 1992, set in the same world as HeroQuest), and praise was given to "Advanced HeroQuest" as well as to the company who made it (GamesWorkShop). It was stated that it was more likely that Space Crusade (another collaborative work between Milton Bradley and GamesWorkshop from back in the day) would be remade than HeroScape (which recently failed to meet its funding goal as a HasbroPulse pledge product) implying they were looking into that. Previously talk about Space Crusade had been that there was "resistance on both sides" to seeing it be re-released. While negative, this news implies it was at least being looked into. Who knows?
While it has been some time since the official release of the Mage of the Mirror, we have yet to see the Companion App be updated to include this material (it often lags behind the physical releases, presumably due to the difficulty in programming in the various gimmicks in each quest and recording the voice work for it, along with the original artwork that is created). Some were similarly disappointed that there was no "free quest" released to coincide with the Mage of the Mirror, but imagining the depth of a full fledged expansion like "Rise of the Dread Moon" may be one of the reasons why these things are slow to materialize.