Batman: Arkham Asylum to Feature Diverse Cast of Batman Villains?

Next year Rocksteady Studios and Eidos will be releasing Arkham Asylum. The basic idea, from what I can gather, is that there's some sort of problem at Arkham Asylum, where some of Gotham's worst baddies are housed (err...held against their will). The Joker, the Riddler, Killer Croc, Two Face and a host of other Batman villains will be supposedly let loose and Batman will have to deal with them all, the Joker being the leader of the pack. Also, I'm keeping my fingers crossed that Harley Quinn will make an appearance.

I'm curious to see how this one's gonna go, to be honest. From the screenshots I've seen, it looks to be a darker Batman title, much like the Nolan films are. Also, I read that Batman will be more of a detective in this game, which should be an interesting return to the Dark Knight's roots.

Keep your eye on this one, kids.