They were clear. They said that they hope to have HK-51 in by the end of the year. They do not have a date on Cathar because they will add them when "they are ready" meaning the work going into making them a playable race is finished. That may be this year, but they don't know and won't say.
Cathar are the only race they are working on. Any further development of other playable races is on hold until they can see how Cathar go over, and plan accordingly.
Yeah, I don't get this at all. There are several very popular species that they should be able to easily add to the game as they already have them throughout the game as NPCs.
They really only have two Rodian models, for instance, that they re-use, both body-type one, male and female. They have one Devorian model, male, and the NPC companion is distinguished only by a broken horn. The same applies across the board - one Duros model, a couple of Togrutans, a couple of Nautolans etc. It would seem that there is a fair amount of work that goes into making an NPC race playable. Of course more will come. But things take time.