The game isn't out yet and they're already talkin' DLC. But hey, that's common practice these days.
The extra content for the upcoming Batman: Arkham Origins will expand upon a journey that should take "about 12 hours," according to a report from Eurogamer .
First, the Initiation DLC will feature the story of Bruce Wayne's early combat growth, which involved his ninjitsu training. He had to prove himself to Kirigi, who taught the way of the ninja to both Bruce and the head of the League of Assassins, Ras al Ghul. As this info implies, this will allow players to step outside Gotham City for the very first time in the franchise's history. Second, there's a new difficulty mode that will come with this DLC; it's called I am The Night and it'll become available after unlocking the New Game+.
Be careful, though: There is no saving and Batman only has one life. …and that just sounds totally insane. Good luck with that.
Related Game(s): Batman: Arkham Origins