Obsidian Entertainment - South Park RPG
According to Gameinformer The "leading animation franchise" that Obsidian is working on is South Park. There is not that much info on the game itself other than it's South Park. Here's about all the info on the game:
Thanks to a collaboration with THQ and Obsidian, Parker and Stone are writing the script, performing the dialogue, and overseeing the development of South Park: The Game. Unlike the cash-in Acclaim titles from over a decade ago, this ambitious project is a full-scale RPG for the Xbox 360, Playstation 3, and PC. As the new kid in South Park, it'll be up to you to make friends and defend the town from a wide range of threats. Be sure to check out our January issue for all the details, as well as an interview with Parker and Stone themselves.
Thanks, Jaesun for the heads-up.