A free update is headed to the Oculus Rift Windows 10 app on December 12th that will allow gamers the ability to stream Xbox One games directly to the Rift when connected to a compatible PC.
This feature will be similar to that of streaming Xbox One games to your PC, meaning that it won't add any new VR functionality to the gameplay itself although you'll be able to play the title as if you were looking at a large virtual display. This type of display functionality is already present in Oculus apps like Netflix.
Due to the need for a reliable internet connection for this kind of streaming, you'll likely want to be connected via an Ethernet cable to ensure the smoothest playback without lag or dropped frames.
Source: Ars Technica