Actually he answered two of my questions.
Directly from the mIRC format:
<nall> Butters asks, is Paris Hilton still trapped in Mr. Slave's body?
<MattStone> Paris Hilton is ass deep in Slave. She is slowly finding her way out via 5th avenue, vegas, miami and london.
<nall> Butters asks, Will you and Trey be in any of the episodes as guest stars?
<MattStone> too weird. We thought about it in this one episode, but we would have to come up with a way where it didn't look super lame self-promotional. Even though it would be exactly that, we wouldn't want it to LOOK that way