Batman: Arkham Origins, as the name suggests, is a prequel for the other two Arkham games, set a couple of years before Batman: Arkham Asylum.
Although Origins is being made by WB Montreal rather than Rocksteady, the original studio did advise Warner Bros.' in-house team on elements of the game engine and mechanics.
Warner Bros. has said that while the combat system hasn't been greatly altered, players can expect new enemies, requiring new tactics. This very brief teaser trailer introduces Deathstroke as at least one of the villains Batman will face during the game.
(Source: CNET Australia)