No matter which races end up making it in the game, I hope the choice will actually matter. Thinking back to NWN2 for example, if you played a drow you'd get exactly one (1) line of dialogue where an NPC would question why you are around. It can be an important factor for the immersion and the replayability of the game to make sure every race gets the appropriate writing attached to it.
So I believe it would probably better to go for a "less is more" approach when it comes to the number of playable races. Though I of course hope for there being proper subraces, but I wouldn't be surprised if they have to skip out on those.
Well just to compare, the just announced CRPG Pathfinder: Wrath of the Righteous from Owlcat makers of Pathfinder: Kilngmaker will have, assuming nothing gets cut from PF:KM at least 17 classes with at least 4 archetypes each, a few Prestige classes as well, 6 Mythic Paths including Lich, Celestial Angel, and Trickester, and Elves, Humans, Halflings, Dwarves, Half Elves, Half Orcs, Aasimar (7 subraces), Tieflings (10 subraces), and a new race which has not been identified yet, and they have promised race will matter.
And they are doing it on a much, much smaller budget then BG 3 (over 200 internal staff and 100 external staff for BG3, hundreds of staff more Owlcat has)
So that gives you an idea of Baldur's Gate's 3 has to compete with.
