For classes, necromancer would be my most wanted. I’d even be fine with it being a class skin for warlocks.
As for races I want playable, I again will share my “Horde Triforce of Hope!™” for playable Horde races I want:
Courage! (Saurok)
Wisdom! (San’layn)
Power! (Ogres)
I agree. WoW could really use a playable lizardman race. If you’re interested, I heavily support Horde Saurok and have different ideas and such for them in my Saurok megathread:
Would really make my day to see them as a playable Horde race. 