assuming they are staying with four players in a game (5 with a player representing Zargon/Morcar) which of the original four heroes would you drop in favor of playing one of the newly designed characters the Druid, Warlock or Orc Bard, and why?
(really, why? in the case of the orc bard)
there is no indications that they would add rules to the effect of increasing the number of adventurers in the party which would necessitate increasing the number of monsters/traps and overall difficulty. So that means either the Dwarf

Wizard

Elf

or Barbarian

gotta stay home in favor of one of the new characters...
personally I dont see that happening in any of my games, none would be a better or even adequate replacement
By Crom I'll split you crown to crotch to see if your guts are yellow as I think they are nithing BARBARIAN Ulrich
The last music you shall ever hear will be my bowstring as your forehead sprouts a feathered shaft, pity ELF Cael Darkhollow
Tomes grimoires manuals atlas formularies compendiums codexes bestiaries folios scrolls... Am I missing anything before we leave? WIZARD Eldritch Heironymous KigamMagister
Some quick axe work an' we can count the coins and gems DWARF Wulfram Magnussen