The new 66 style animated movie will be released on BluRay and DVD on November 7th. To ensure you get a copy on release day pre-order yourself a copy. The BluRay has a limited edition release which includes a set of art cards. Also you can get a HD digital download or standard DVD copy, both links are below.
Batman: Return of the Caped Crusaders
Batman: Return Of The Caped Crusaders + Limited Edition Artcards [Blu-ray] [2016]