The cool but short Batman Arkham VR game released for PlayStation VR last year is now out for Oculus Rift and the Vive. This is a canonical part of Arkham lore, but saying just how it fits in would be spoilers. Read: Our review | A fun easter egg for it in Arkham Knight.
Source: Kotaku – The cool but short Batman Arkham VR game released for PlayStation VR last year is now out for Oculus