It's out tomorrow
As you may have heard, Batman: Arkham Origins is getting psuedo-story related DLC. It'll hit the PS3, 360, PC and Wii U tomorrow, and will focus on Bruce Wayne's pre-Batman training. You'll net a new mini challenge oriented campaign for your troubles (over four new maps), and two skins -- both Bruce Wayne related.
The challenges take place in the Paektu-San Mountains of North Korea, and will take you through a bamboo forest and a monastery. If you already bought the Season Pass, you can just pick this up tomorrow.