It's ninja related
Batman: Arkham Origins is no stranger to DLC, and alongside of the lackluster Season Pass comes the announcement of the first story related add-on. I use the word "story" lightly, as the game is actually a challenge map pack with a narrative built into it. It'll follow Bruce Wayne's trials to become a ninja, while still keeping the challenge arena theme -- so think Batman Begins.
More ancillary DLC has launched today, including the Infinite Earth Skins Pack (with six new costumes for $4.99 on PC, PS3 and 360, and $3.99 on Wii U), the Black Mask Challenge pack ($1.99), and Online Supply Drop #1 ($2.99). Some of this is Season Pass related -- some isn't, so check the listing first before you buy anything.