I got to say, a batman game without batman seems interesting. At least the Team at Monolith thinks so, they released the first in game trailer for the upcoming Arcade/PSN game Gotham City Impostors today. Showing off melee, and gadgets you would come to expect from a Batman game. The Team-based Shooter pits you as either Batman impostors or Joker Impostors, each with their own weapon and abilities, looks like a load of fun.
Source: Joystiq