After a long time WB Games Montreal finally revealed what they've been working on.. and it's a Batman game with everything but the Batman.
In a short gameplay demo that was more interactive corridor walking than real gameplay we see that the crux of the game is being able to play Batgirl, Robin, Red Hood or Nightwing with what appears to be seamless drop in multiplayer (this is pure speculation from what I saw and not like a fact).
All the Batman games were varying shades of good - some were great! - so it's not like this is a bad thing, but after all this time.. it's kind of ..very basic. I'm also convinced that Batman is obviously alive and will show up at some point during the game. There is a tie-in to the massively popular Court of Owls storyline from Batman so you might play as the caped crusader in flashback sequences if nothing else. Guess I was expecting a little more, but hey, I guess I wouldn't mind playing another one of these.
Here is some solid gameplay footage