The latest video teases the upcoming Harley Quinn DLC, which releases later this month.
'Harley Quinn's Revenge' contains more than two hours of additional gameplay, allowing fans to play as both Batman and Robin.
Taking place after the events of the main campaign, the DLC tasks players with stopping Harley Quinn's plans and shutting down the urban prison forever. It will feature new locations and enemies.
It launches as an individual download for PSN and XBLA from May 29. Pricing is yet to be confirmed.
Batman: Arkham City shipped more than 4.6 million copies during its first week on sale, and won the award for 'Best Action' game at this year's BAFTAs.
The DLC precedes this year's Batman: Arkham City - Game of the Year Edition, which will be released in Europe on September 7.
> Feature: 'Batman: Arkham City' - How the Dark Knight went open-world
> Read our review of 'Batman: Arkham City'
Photo gallery - Batman: Arkham City screens:
Copyright: Warner Bros.