And again it all comes down to a matter of family.
Set prior to the events of Batman™: Arkham Asylum, Batgirl: A Matter of Family will allow players to take on the role of Batgirl for the first time in the Batman: Arkham franchise.
Batgirl: A Matter of Family will be available July 14 for fans who have purchased the Batman: Arkham Knight Season Pass and are connected to the Internet, or it can be purchased separately on July 21 for $6.99 MSRP on the PlayStation®Network and Xbox LIVE online entertainment network from Microsoft
See the Batman: Arkham Knight– Batgirl: A Matter of Family DLC Trailer below:
Batman: Arkham Knight “Batgirl: A Matter of Family DLC” releases July 14th 2015 for season pass holders and later on July 21st 2015 on Xbox Live and PSN