I see a bunch of people refer to any potential new race added to the game as an Allied Race, when currently the only ones added or discussed by Blizzard have been variants of existing races.
I personally wouldn't consider Vulpera, Ethereal, or Ogres an Allied Race, I would consider them a brand new playable race the way Blood Elves, Draenei, Goblin and Pandas were.
Even the WoW website has Races and Allied Races separated, which to me would imply they are different things.