Though there has yet to be an announcement from developer Obsidian Entertainment or publisher THQ, the upcoming role-playing game set in the South Park continuity appears to have a name, according to an early listing on the Xbox Live Marketplace. It's "The Stick of Truth."
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You can see its provisional cover art at the link on Xbox Live. That release date (today) is quite erroneous.
Rumor: Obsidian's South Park RPG Has A New Name [Game Informer]