PS4 Batman Bundle Official Site
You can read many information and details about PS4 Batman Bundle in their manufacturer site. Details like product features, manufacturer limited warranty, hardware specs and etc.
https://www.playstation.com/en-us/explore/ps4/

Batman Arkham Knight on Wikipedia
In Wikipedia Site, you can browse the complete list of Batman Arkham Knight video game series including history, reference, platform and etc.
https://en.wikipedia.org/wiki/Batman:_Arkham