I was always going to be playing the Bounty Hunter first, regardless of races available to choose from for the class. But I am disappointed in how little races there are available to choose from. I'll be going for a human BH, I don't like the Rattataki and I'll reserve the Zabrak or Chiss for other classes.
As for races playable in future expansions: I'd like to see Kel Dor, Ithorians but especially Rodians. I mean, come on, they're Rodians! One of the most recognizable species in Star Wars!