Official Batman: Arkham Knight – Batgirl: A Matter of Family DLC Trailer July 8, 2015 The Taylor Network no comment on Official Batman: Arkham Knight – Batgirl: A Matter of Family DLC Trailer Those with an “Arkham Knight” season pass will get early access to the Batgirl-centric prequel on July 14. The expansion pack will be sold separately starting on July 21. Share this:TwitterFacebookLinkedInPinterestRedditTumblrLike this:Like Loading...