Monolith Productions is working on a downloadable first person shooter where players play as impostors of The Batman and Joker. Gotham City Impostors is set for release on Xbox Live Arcade, Playstation Network, and PC.
It looks like customization of your player characters plays a big role in Impostors as costumes, gadgets, and weapons all are available for choosing. The gameplay revolves around 4v4 team based multiplayer and includes maps and modes inspired by the franchise.