Will there be alien races that have yet to be discovered? We know about the Vanduul, the Banu and the Xi'an.

There's them. I mean, it's a weirdly loaded question because if people know that there's an alien race out there but it hasn't been discovered, how do we know? Then you know that it's there to be discovered.

But you haven't ruled out the possibilities.

No, I mean, it's the sort of thing of, we have allusions to ancient civilizations. There's the Hades system and stuff like that, which is the decimated system that has a planet cracked in half type thing. And the ruins on Kazi in Terra, so there are allusions to long-dead civilizations. So... maybe?