According to the listing's description (translated by Google), the collection includes remastered versions of both Batman: Arkham Asylum and Batman: Arkham City plus all DLC released for both games. It will not include Batman: Arkham Origins, the description suggests.
The listing follows an earlier leak by PEGI, which rated 'Batman: Return to Arkham - Arkham Asylum' on PS4, and an alleged document from GameStop, which claimed that the games would feature "updated visuals".
VideoGamer.com also heard that a remastered current-gen collection was in the works last year.
Warner Bros. has yet to announce the collection, but with leaks continuing to appear expect it to be made official fairly soon.
Source: gamestop.it (via @lifelower)