The official announcement for the next DLC pack for Borderlands has not been made yet but some trophies for the Playstation 3 reveal that it is on its way. Here are the trophies that are added to Borderlands that reveal some more Coliseum content.
Completed the lesser challenge in all 3 coliseums
Completed the larger challenge in the Hell-Burbia coliseum
The Angelic Ruins
Completed the larger challenge in The Angelic Ruins coliseum
Completed the larger challenge in The Gully coliseum
Completed each of the larger challenges in all 3 coliseums
These Playstation 3 trophies will also presumably be the added Achievements for the Xbox 360 as well. Official pricing and release date for the DLC have yet to be released.
The new DLC will be entitled Mad Moxxi’s Underdome Riot and will be available on December 29 on XBL and January 7 for PSN for $9.99 or 800 Microsoft Points. Mad Maxxi’s Underdome Riot will add a new bank to store weapons as well as three new Riot Mode arenas.