If recent reports can be believed, Apple has a secret division that's been experimenting with VR and AR technology long enough to develop Hololens and Rift-like prototypes.
According to a report by Financial Times (via Macrumors), Apple's "secret research unit" consists of hundreds of employees who are actively studying virtual and augmented reality tech. The team is made up of field experts like Virginia Tech VR specialist Doug Bowman as well as others hired from Microsoft and Lytro--who developed a Light Field Camera similar to RealSense.
The evidence of Apple VR has been building in recent months, and specific clues hint what Apple might do with its VR/AR tech. The Cupertino tech giant recently snapped up key startups like the motion capture guru Faceshift, whose tech was used in The Force Awakens, and the German AR Metaio, which made augmented reality software and content. We know what the startups are, and what their tech does, but we just don't know how exactly Apple is using them--the Financial Times suggests the AR/VR tech could somehow mesh with Apple's Project Titan electric car.