Priced at 800 Microsoft Points ($10), the Raising Hell DLC contains new single-player content and levels. The 400 Microsoft Point ($5) Challenge Pack adds seven new multiplayer maps and the legendary difficulty for single-player. nope
Available free of charge, the Split-Screen Multiplayer Pack brings offline split-screen mutliplayer to the game, along with a new multiplayer map. All three packs are currently available from the online Xbox Live Marketplace.
European owners of the PC version, meanwhile, can obtain the content from Metaboli. No details on an eventual North American release of the PC content were provided.