Last month, a leaked photograph revealed the existense of the Batman Arkham HD Collection, a bundle featuring a remastered version of both Arkham Asylum and Arkham City, as well as previously released DLC and additional content.
The leak was said to have originated from a GameStop employee, though it's validity remained in question. Luckily, GameStop has gone ahead and teased the remastered game bundle once again.
On a now removed page, GameStop Italy (via WCCF) listed the remaster, along with its DLC once again – except this time the listing included a release date. According to the listing, the 'Batman: Return to Arkham HD Collection' will be releasing on June 6th, 2016.
Neither Warner Bros. or Rocksteady have confirmed the game's existence or its release yet.