I would be happy to try the other races.
But I'd rather most of the bugs be sorted out first. Having been involved in the beta for Sins, then entrenchment, then diplomacy and now rebellion, I'm happy with the way they work and trust they will get something out worth testing.
If the TEC are locked out when we test the Advent, I'd be happy with that, and the same with Vasari. Afterall its not a published game yet and I get to tinker with things that won't be in the final game.
I'm a little disappointed I missed the multiple titan exploit, would have been interesting playing with that. Though I did do the spam of corvettes and see them take out many enemy ships (including themselves most of the time) and some of these things won't make it into the game but a cool to try out.
So thanks to the dev's for letting us play while they work. We'd all like you to hurry up, but that only because the game is so much fun 
Keenly (and as patiently as possible) waiting on the next update.