Details are still very sketchy — but Warner Brothers today announced that Batman Arkham Underworld is under development for mobile platforms. Here’s their description of the game:
Rule Gotham City! Build your hideout, then recruit and train an army of henchmen to do your bidding. Command iconic super-villains from the Batman: Arkham universe, including the Riddler, Harley Quinn and Killer Croc, to become Gotham City’s next criminal kingpin.
Mobile games also under development from Warner Brothers Interactive Entertainment include Mortal Kombat X, Lego Batman: Beyond Gotham, DC Comics Legends, and an untitled Game of Thrones game.