But until then, believe the hype: Batman: Arkham Asylum is very, very, VERY good. I'll even say that without completing it yet, it's already my personal choice for best video game of 2009.
Don't even think about whether you want this game. Because you do. You really do. The inmates are running the asylum... and you're trapped with them. And when said inmates include the Joker, Riddler and Killer Croc among many others, there can be no doubt that you are in for a hella scary (and thrilling fun) stay.