According to the video discription, here's what the update will include:
Season Pass holders receive early access to the 2016 Batman v. Superman Batmobile Pack, which includes the Batsuit and Batmobile from the highly anticipated Warner Bros. Pictures film “Batman v Superman: Dawn of Justice.” Also available today are two new Arkham Episodes, which give players the ability to control two of Gotham City’s most well-known characters, Catwoman and Robin. Catwoman’s Revenge takes place after the events of Batman: Arkham Knight and puts players under the cover of darkness as they seek revenge on the Riddler. Flip of a Coin lets players take control of Robin as he looks to take down Two- Face’s lucrative money laundering operation. Both Arkham Episodes also include two AR challenge maps.