Keeping busy this Holiday season, Gearbox Software has announced that they're working on a second DLC pack for their hit co-op shooter, Borderlands. Dubbed "Mad Moxxi's Underdome Riot", this DLC will add bank storage to the game, along with the ability to acquire two additional skill points via quests and three new Riot Mode arenas, where you and three of your friends will work together to fend off wave after wave of Pandora’s baddest enemies. The Underdome Riot will be available for the Xbox 360 on December 29th and the PlayStation 3 on January 7th. A PC release is planned, but no date is offered. We'll be sure to keep you posted!