Batman: Arkham Knight is set in an even larger version of Gotham City than its predecessors managed. It's so big, they've had to include the Batmobile so you can get around quicker. How else are Rocksteady leveraging the muscle of modern PCs? Will we face another rogues' gallery, a la Arkham City? How will the combat system change from the first games? I sat down with Rocksteady's marketing producer Dax Ginn to find out.