Next Expansion will add a Sub Race for every Race
Saw some screen shots, I can't prove their authenticity but I trust the source - and they would be the most dedicated fakes otherwise. My wow lore isn't great but I'm sure some of you will understand the story behind these
Big Barbarian Humans
Centaur Elves
Stone Dwarf
Corrupted Dranei like Akama
Buff Worgen
Mecha Gnomes
Half Ogre Orcs
Buff Forest Trolls
Bison Tauren
Human-like Undead
Undead Elves
Fatty Goblins
Tuskarr!
In addition there is tons of customization stuff for the normal races. Lots of haircuts and beards and skin colors etc for everybody. Orcs are getting a different animation where they kind of look like Thrall