Originally Posted by
Destinas
To me this isn't a big deal. They previously said they considered "anything with two legs" for Allied Races, meaning that they would have considered plenty of things that aren't related to current playable races anyway - mostly animal races.
Discounting lore, of course, Vulpera use the Goblin animations, making them a (fairly) standard Allied Race in that regard - Kul Tirans and Zandalari males broke that trend already. They could easily do the same thing for something like Saberon later on, updating how the Saberon look, while using the new Worgen animations.
Or, they could make more Allied Races that have completely new animations. The other major things that differentiate an Allied Race from a "Main Race" are:
a.) A reputation/achievement/questline required to unlock them.
b.) One racial mount (as opposed to 5-6).
c.) No racial small pet from pet trainers (every base race has one, every AR does not).
d.) Heritage Armor released with them (though, new "base races" could come with this too in the future).
In the end, I feel like this first pass of Allied Races was mostly just copying different animations of other races, with a couple outliers. They stated that they would add more Allied Races after BfA, just not as many. It's entirely possible they could move on to other races for a while, reusing some animations, and passing over each race again (like Broken that could use Tauren animations and/or Draenei animations, Taunka, Forest Trolls/Revantusk, Wildhammers, etc). Or, they could make any number of other races that people have wanted, related or not (Ogres, Arakkoa, Vrykul, Ethereals, and Naga are all races that people have asked to play for a long time).