I've been playing Arkham City for about three or four hours. I'm at 3%, obviously I'm not quite at the point where I need DLC. But for people who have played the game religously since release, and I know there are a huge amount of you out there, you'll be happy to know there is more DLC on its way.
To be released on the 20th of next month, just in time for your Christmas break, the new pack will give you access to the Bat Cave, as well as the previously available Joker's Carnival and Iceberg Lounge.
No word on the price yet, expect it to be similar to previous packs.