At this year's E3 press conference for Microsoft, there was brief mention of South Park game for Live. We're know few details, but here's what M'Soft had to say in a press release about the game:
“South Park” (South Park Digital Studios/Doublesix/Microsoft). Based on the Emmy- and Peabody-award winning show, a “South Park” game (title TBA) is coming exclusively to Xbox LIVE Arcade in 2009."
We'll let you know more when we know more.