IGN reports new trophies for Arkham City have popped up.

This looks like the alleged Harley Quinn DLC. From the sounds of it, this is a Robin Story mission (from destroying balloons, like collectibles found in the story mode) and the moves listed in the achievements reference Robins moves in his DLC. Sounds like more challenge maps as well.

sounds interesting, just saw an article over on comicvine as well! looking forward to it

Oh cool, I didn't realize they were going to do any other DLC for the game.

I was honestly surprised at this news! Excited though, I hope it gives an insight into the third game!

More fuel to the fire, this is off the games twitter account.

@IIGrayFoxII: so freaking excited about it! :D can't wait for an official announcement!

I look forward to playing more Arkham City!

@IIGrayFoxII: Guess this is it http://www.youtube.com/watch?feature=player_embedded&v=1m7aOkmr7T8 After the ending according to news sites.