I've been doing some looking for info, because I'm very interested in this game since it looks so good - so I'll post things as I find them. I read that they are going to have versions for PS3 and Xbox 360, too.

Here is IGN's page about the Darkness for the 360 (and it's got a few more screenshots that look pretty great too): http://xbox360.ign.com/objects/720/720416.html