More-derlands: Mad Moxxi's Underdome Riot

I've not even had time to starting playing the first bit of expansionising DLC for Borderlands and another one has been announced. Titled "Mad Moxxi's Underdome Riot" it will apparently feature "an intense single-player or cooperative experience that expands the mayhem by adding three new Riot Mode arenas where players will endure an onslaught of Pandora’s baddest enemies." Hmm. Additionally: "Mad Moxxi’s Underdome Riot also adds a new bank feature, which allows players extra storage capacity for when they encounter one of the more than 16 million weapons that Borderlands has to offer; and the ability to acquire two additional skill points as quest rewards, making their characters even more powerful than before." So that's good, but shouldn't a bank or locker system have been patched it anyway? Wasn't it one of the most obvious oversights in the basic game?

It's hitting consoles on the 7th of January, and the PC release date is, naturally enough, undisclosed.