I would guess personally all classic races, i.e. Human, Elf, Half-Elf, Dwarf, Halfling and Gnome, as well as their subraces. Plus Half-orc, Tiefling/Aasimar, Genasi. And maybe Dragonborn and Goliath at later stage (potentially an expansion) if we are lucky.
Anything beyond that really exceeds what is needed for a DnD CRPG in my opinion. Also, what is the point of having many playable races, if NPCs don't regard you any different than they would a human? Personally that sort of thing I find really hacky. I love it when you actually get a different reactions and experiences from NPCs and the story simply by your choice of either race, class or attributes. That sort attention to detail in a game does kind help give you the illusion that you are participating in your own story, which is definitely a major plus in a CRPG.
