After being mentioned in the GTTV Presents GameStop Unwrapped TV special on Thanksgiving, it looks like the newest location for players to kick the asses of Gotham's worst criminals is going to be the Dark Knight's innermost sanctum. A new DLC pack's coming on December 20th, which bundles the all-new Batcave challenge map, along with the previously available Iceberg Lounge and Joker's Carnival maps. There's not been a press release about the Challenge Map Pack yet, but Rocksteady Studios confirmed the date on their official Twitter account. No word on pricing yet, but expect it to be in line with the range of previous add-ons for Batman: Arkham City. We'll update when we learn more.