Warner Bros. has announced that DLC story add-on Batgirl: A Matter of Family for Batman: Arkham Knight will be released on 14th for Season Pass holders and on July 21st for everyone else.
The DLC is currently only listed for PS4 and Xbox One, which shouldn't be too surprising given the severe technical issues affecting the PC version of the game. Such is the scale of the problem that the game is not currently being sold on PC.
A Matter of Family was developed by Warner Bros. Montreal, the studio behind Batman Arkham Origins, rather than Arkham trilogy studio Rocksteady and will be available for £5.79 if you don't have the Season Pass.
Set before the events of Arkham Asylum, the DLC also stars Robin.
All future DLC for Arkham Knight will be developed by Rocksteady.