CCP has announced the arrival of the remaining three races' captain's quarters sometime in October. You can view the blog post by CCP here.
I have to say, even though I play Amarr, my favorite quarters, by far, are the Gallente. Hopefully the quarters you see are based on who constructed the space station you're in and not upon what race your character is. If that's the case, I'll be spending my time in Gallente-built stations. I really like the look of the Caldari quarters too. Unfortunately, I think the Amarr quarters look too much like the Minmatar quarters.
Also, they're finally going to fix it so when you log into the station, you're facing your ship instead of a hallway. Thank you! I've been wanting that from the beginning of Incarna.
There are a few more pictures on the blog as well as a short video.