I don't want new races because Blizzard has a hard time providing new story for the ones we have. I really don't want them to create new characters for whatever race they add and then leave them behind immediately after the leveling experience.
I remember how pumped I was for Worgen, and then right after the starting zone they pretty much didn't exist.
It was really only until WoD that the Draenei mattered again, and they seem pretty absent from Legion considering this is pretty much what their history is based around.
Night Elf lore is all in books.
Poor Gnomes.