"To keep the action coming after launch, DICE is currently developing downloadable content that will be available at the beginning of the year. More details to be announced shortly," reads a press release from the publisher.
The release may be short on details, but Sony has previously flaunted exclusive DLC for the PlayStation 3 version of the game. However, that exclusivity could apply to a specific level or release, not DLC in general, leaving the PC and 360 versions open to DLC.
Meanwhile, a specific date has not been set for the delayed PC version. Rather, only a release window of January is known at this time.
Update: Downloadable content for Mirror's Edge will be released in both PlayStation 3 and Xbox 360 form, EA DICE confirmed with GameCyte.