Following all the previous leaks, now the box art for Batman: Return To Arkham has accidently hit the net.
A WB magazine (see below) and an Italian GameStop web site have a listing for the game, box art and info.
Batman: Return To Arkham is a remastering of the first two games, Batman: Arkham Asylum and Batman: Arkham City, which comes with updated graphics and all the DLCs.
It's listed that Batman: Return To Arkham will go on sale June 10th; however, WB and Rocksteady have yet to make an official announcement.
The latest game, Batman: Arkham Knight, is not a part of Batman: Return To Arkham.
Batman: Return To Arkham will be available for PS4 and XBox One.
Info (via reddit):
Street Date: Available from 10 June
Batman: Return To Arkham
It INCLUDES THE SECURITIES critically acclaimed BATMAN: ARKHAM ASYLUM AND BATMAN: ARKHAM CITY
UPDATED AND ENHANCED GRAPHICS FOR Playstation4 AND XBOX ONE
THE COMPLETE VERSION INCLUDE ALL DLC And I ADDITIONAL CONTENT PREVIOUSLY ISSUED