Microsoft appears to be working on an augmented reality headset of its own, similar to Google's Project Glass.
In a new patent application, the company describes a glasses-based system that overlays information onto the user's view.
Unlike the Google version, though, it's envisioned as something you'd wear specifically for live events rather than all day every day - at a baseball game, for example, where scores and other information could be displayed.
The glasses could be dished out to spectators at the beginning of an event, in much the same way as 3D glasses are at the movies today.
"A user wearing an at least partially see-through, head mounted display views the live event while simultaneously receiving information on objects, including people, within the user's field of view, while wearing the head mounted display," reads the application.
"The information is presented in a position in the head mounted display which does not interfere with the user's enjoyment of the live event."
Eye tracking would be used to work out where the user's looking, and GPS to work out precisely where they are, and the data tailored accordingly.
While the patent application doesn't mention the Xbox, the system looks an awful lot like the AR glasses leaked this summer as part of an internal Microsoft presentation on the future of the Xbox.
And as an eagle-eyed Geekwire writer noticed, one of its two inventors is Kathryn Stone Perez, executive producer on the Xbox incubation team.