The Inititaion DLC adds challenge maps which tell the sort-of Origins of Batman, and thus don't really star Batman, but a bearded Bruce Wayne. There's a trailer and an explanation below.
Here's the description:
Set high in the Paektu-San Mountains of North Korea, the Initiation Add-On follows a young Bruce Wayne as he faces his ultimate test. Players will embark upon a series of challenge maps that test their martial arts training across exotic locales, including a bamboo forest and a mountain top monastery. Fans will face fresh enemies along with an epic final test to prove their worthiness to Bruce’s greatest and most pitiless teacher, Kirigi.
Greatest and most pitiless teacher? Ra's al Ghul, you just got schooled.
Kirigi is actually an obscure Batman character who appeared in the comic "The Man Who Falls", which re-told Batman's original story in 1989. Maybe this is also all happening in World Two, but really, who cares. The DLC has men and you can punch them. It's out today and costs £5.49.