For those of you who won't be off in a galaxy far, far away on December 20, new downloadable content will release for everyone's favorite caped crusader.  A challenge map DLC for Batman: Arkham City has been teased and according to this tweet, gamers will be able to explore the Batcave, Joker's Carnival and the Peguin's Iceberg Lounge.  No other information is available at present, but at least we've got a bat-date to look forward to.  

[via Joystiq