Xbox One games such as Halo, Forza, and Sunset Overdrive will be available to stream to the VR headset.
The Oculus Rift will also natively work with Windows 10. It is clear that Microsoft wants to jumpstart gaming on the Windows platform. However, it should be noted that Microsoft did announce the Microsoft HoloLens. Perhaps this means that the HoloLens will not be gaming oriented.
Oculus VR CEO Brendan Iribe went on to note the need for Oculus to come packaged with a controller, prompting the announcement that each Oculus headset will come with an Xbox One controller and adapter.
It will be interesting to see if the relationship between the two companies expands to exclusive games and software, or if this is the full extent of the relationship.
The Oculus Rift is slated for a Q1 release date, but in the meantime you will have to play your Xbox One games the old fashion way, perhaps on one of the fancy new 1TB consoles.