All we've got is Humans, humans with metal stuck to their faces, extreme skin tone humans, and some humans with thinks coming out of their heads.
Its Star Wars! We need a much bigger variety of races. I dont know if anyone was really clamoring for the Ratatakki or Mirialan over, say, Wookies or Mon Calamari. It just seems like it was an easy way to keep the same basic human models and use them over and over, due to time or clipping issues. But as we've seen tons of races in the game, some of them as great companions, that doesnt seem to be the case.
So what we need is more races to play. Star Wars races. The movies had lots of kinds of great aliens, and the EU added tons more to that. I'm not saying we need 60 playable races, but definetly some of the more iconic ones, if only for varieties sake. Plus imagine some of the great stories that could be based on them as well. This could even be something like a race/class combo, whereas the race is limited to a specific class, thus tying the two together in a very good and specific, tailor made story.
Wookie who escapes from slavery.
Droid trying to make its way in the galaxy.
I dunno, stuff.
Maybe have Legacy tie into unlocking these as a nice incentive to keep playing past end levels.