The Batman: Arkham City OST has been announced and will feature scores from artists including Panic! At the Disco, Daughtry, Black Rebel Motorcycle Club and Coheed and Cambria to name just a few. The soundtrack will be out October 4th, two weeks before the game. If you are getting the collectors edition of Arkham City, a download code for the soundtrack will automatically be included.
I'm not really into music, I don't own that many soundtracks, but if I enjoy the music from a game, movie or show enough I have no problem paying money for some sweet tunes. Sadly I don't listen to much contemporary music either so while I am familiar with some of these artists, I don't love any of them. Guess I will have to wait and give the songs a listen to determine if I buy the OST based on quality, not name.