UPDATE: The official press release is out, bringing us fresh details--and the game's logo.
Gotham City Impostors pits an army of fake Batmans against an arm of fake Jokers (a clever narrative way of getting around Batman's inability to wield a gun) with a detailed customization system. The release claims players will have access to "insane costumes, homebrewed gadgets and a wide range of traditional and imagined weapons."
At the event in Los Angeles, Warner Bros. allowed judges (in this case, our very own Mr. Gerstmann) to play a map called Amusement MIle.
You read that right.
Kicking off a series of pre-E3 events down in Los Angeles, Warner Bros. Interactive Entertainment today announced Gotham City Impostors, a downloadable, first-person, competitive multiplayer Batman game. That's a mouthful.
That's about all we know about the game right now, though. Stay tuned for more details!