Gearbox Software's next DLC for Borderlands, Mad Moxxi's Underdome Riot, is now live on the Xbox 360's Xbox Live service to download with the PS3 version due out next week. While we PC owners are having to wait for our version our sister site Joystiq has a new trailer that shows off some more of what we can expect from the mini-expansion.

The trailer shows off and names the three arena maps that will be in the DLC (Hellburbia, The Angelic and The Gully) where players will have to face off against waves of enemies. New modifiers like Dodgeball and Loaded will be included and a new "bank" is added for more storage space for weapons and items. There's still no word on when the PC port will be released.