The trailer for the next Arkham City DLC harley Quinn's Revenge starts out about how you'd expect—with lots of hot (or, "hot") close-ups of our favorite ICP groupie Harley Quinn walking slowly away from the camera.
It then shows the new style she'll presumably be rocking in the downloadable add-on. I like what you've done with your hair, Harley! Also, Batman's in it for like 1.3 seconds.
As Evan already reported, the add-on will feature a chunk of new single-player content that will let players take on the role of Batman and Robin in a quest to shut the gates of Arkham City forever.