Well its not everyone has to be same race, just same factions. There are three factions, Alliance: Human Elf Dwarf - Horde: Ork, Werewolf , Alfar: Alfar (alfalfar)

From what I know so far, KGBers are almost evenly split between the three with each faction having a group that wants to go that direction.

Though I personally lean away from Horde, not wanting to be Ork. But, the werewolves have a speed boost and can run on all 4's.. if theyre as fast as a mount, never having to buy a horse might prove a big advantage.