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).
