I really hope they include Genasi in the final build. They're a classic Forgotten Realms race and are so much fun to play. Some of my favorites from 5e are Genasi, Dragonborn, Kobold, Tortle, Hobgoblin, and Warforged. Leonin are really interesting, but from a different setting (same could be said for Warforged too, I suppose).
I'd really like to see playable gnolls, but they aren't in 5e yet. This has been a sticking point for me because they're playable in almost every edition of D&D (excluding only 5e and the 80's Basic edition which had race-as-class). I played a gnoll "swarm" druid in 4e, and a gnoll wizard in 3e (yes, before 3.5 and long before Pathfinder).
Playable gnolls won't be a thing. 5e re-did their lore and make them infernal beings that are always Chaotic Evil. Not in the way orcs are, but in that they physically cannot go five minutes without brutally killing and eating something.
I hear you though. I love the monster races and would've liked playable gnolls for Forgotten Realms. Personally my "Probably won't happen" hope are for Lizardfolk. I like druids and I like monster races, but the PHB monster races are all +strength brutes (half-orc/dragonborn) that don't make for good druids.
I still play them of course, but sometimes it is nice to play a character who's attribute bonuses actually align with your class.
