It's a bit of a misnomer to say that the folks at Rocksteady are passionate about Batman. That's because they are super passionate about Batman and Batman:Arkham Knight is the crowning achievement of the franchise.
Last week I was able to get some time with Guy Perkins, one of the marketing folks behind the game to find out about the big new feature in the game (it rhymes with ratmobile) and to talk about about how Batman has changed over the course of their three games.