Last year Batman Arkham Asylum was put out and it proved not to just be a good Batman game, but to be a great game all around. Well when you create something that does really good, and nobody expected it to do good, yoiu want to follow up on it as quickly as possible to keep the ball rolling. So some time probably early in 2011 Batman: Arkham Asylum 2 is coming out.
I haven't been able to see too much about it yet, but from what Ive heard they are expanding on it quite a bit. It looks like not only are the asylum patients out of their environment, but are trying to take over Gotham City. Mark Hammil (yes, Luke Skywalker,) the person who voiced the Joker in the animated series that we all watched as kids will voice the Joker for what Mark says will be the final time.
It is said that Two-Face, Catwoman, and The Penguin are to make appearances in this game. Apparently The Riddle is supposed to make an appearance as well and not just in the same aspect as the first game, making you look for some odd clues, kind of like hide and seek, but he didn't actually hide anything, its in plain site.
If you haven't been able to check out the first game make sure you do so and then make sure you get your hands on Batman: Arkham Asylum 2 when it comes out.