With respect of course, Patrick O'Rourke said in the interview that they didn't have plans to do this actually. They don't want to end up splitting the fanbase between those who played First Light and those who started with the game system... by releasing expansions that REQUIRE First Light (as opposed to expansions that are compatible with both).
Yeah SB has contributed Prophecy of Telor as well as First Light in his quest portfolio to add to Rogar's Hall (and of course the original 15 quests, KK, and ROTWL from the classic era, though with the tweaks and alterations from Mike Gray's team that did the NA adaptation... though "The Maze" hasn't been seen in all these years).
Presumably this hypothetical "First Light Expansion" would feature the Dragon and the "Caverns" board, right? Otherwise it would be already compatible with the GS since it features 100% the equivalent components as both versions of the game system previously released.
I think there may be those who fear that if First Light IS successful we'll see a parallel split between expansions like this or else that existing expansions will be re-released in "cheaper" format with cardboard. Both of those ideas were shot down at GenCon.
While it's true anything could happen (some boss at Hasbro could swoop down with some "brilliant plan" and ruin it all overnight, heaven forbid), I was re-assured by those messages direct from Avalon Hill. You can listen to those interviews on my channel where they sound off, on the record, against those ideas.
Of course none of that stops us fans from creating new free content that uses the extra assets from First Light, that's kind of the whole point.
Let's face it, the only reason they're using cardboard standees in this release is to keep the price point LOW to attract more potential players. Given the choice, most will opt for 3d plastic miniatures instead of cardboard. Yes, there are those who will say "oh but they're so boring being just one color... and I don't want to paint them!" but I think that's a tiny minority. Most people who don't want to paint will be satisfied with the unpainted "unit colors" that HQ has had all these years. Even so, Renegade Game Studios has been offering both painted and unpainted versions of their HeroScape relaunch (granted, the original HeroScape had pre-painted figures, so there was already an expectation and nostalgia for that look, vs. HeroQuest which was always sold unpainted from the beginning).
The great thing about cardboard though is that fans who want to create more standees have a much easier time because they don't need a 3d printer to make minis that approach the quality of what's in the box. Anyone with any printer and some cardboard to use as backing and try their hand at it. So you can make standees for all the sets you own if you want, knock yourself out!

FL uses mostly standees to keep the complete box under $50 retail with the added bonus of the box itself not taking up so much shelf space, which makes it easier for a retail store like Target to stock it next to other games. It's not just about customers feeling "intimidated" by the size and price, but the store itself who values shelf space and moving product quickly.
The box size and price point are the factors here, so if you can imagine "First Light" being $50 on the shelf, you can just as easily imagine The Frozen Horror, the same version that was released two years ago, sitting next to it on the shelf for $45 (or less!). Hopefully that happens soon and who knows, maybe we'll see the big GS box on the shelf as well as the "Deluxe" version of what FL offers. And still there will be consumer choice for those who are not yet ready to take the plunge but just want to test the game out with the smaller box first to see if they like it and want more.
Don't get me wrong, I like SB's content, I would love to see him do more of those commercials for HQ, and more quests he's written. I'd love to read a behind the scenes scrapbook of his development process in some form or another. But another standee set? Probably not.
I think if they did something like that, it would probably be YET ANOTHER game system alternate, maybe starting as a different store exclusive, with another set of compatible quests, rather than a continuation of First Light that required it to play but lost compatibility with the regular GS. If that's what you meant, then I could imagine that. It doesn't divide the community, though it would annoy some fans who are trying to collect everything, though it would serve the function of attracting more new players to the game and satisfy the various demands for "exclusives" that these stores make. I kind of hope they don't do this though. I'd rather just see FL appear in other stores too and become available almost everywhere after awhile, then attract the other existing boxes to those stores once they realize HQ isn't just a flash in the pan but actually a great product that people want, so long as they know what it is!