Update: A press release just came in for South Park: The Stick of Truth, outlining DLC plans and pre-order initiatives – and Kinect integration. You'll be able to taunt enemies and launch attacks using your voice, but perhaps more importantly, "for the first time in South Park history, you can call Cartman a 'fat ass,' and he'll respond."
The first three DLC packs will debut on Xbox 360 first – standalone episodic adventures with their own stories. In addition to that, the Mysterion Superhero DLC pack will also be an Xbox 360 exclusive, adding an exclusive superhero costume, attack and weapon. Finally, all pre-orders will include the Good Times with Weapons DLC pack, which features an exclusive attack, weapon and samurai costume.