South Park: Tenorman's Revenge will launch exclusively on Xbox Live Arcade on March 30. This downloadable game features Scott Tenorman returning to South Park with an army of gingers to battle Cartman, Kenny, Stan and Kyle. After being tricked into eating his parents in chili and getting mocked by Radiohead, Tenorman is probably pretty angry. The game itself seems like a platformer with tower defense style elements.
This is not the South Park RPG that's coming from Obsidian. That game is built on the Dungeon Siege engine and features "traditional" RPG elements with a South Park twist.