The long-rumored Apple Glass could take advantage of data from other units to accurately map an environment, with head-mounted displays capturing data on a scene and sharing it for a better augmented reality experience.
Augmented reality depends on having an accurate measurement of geometry in an environment, with imaging devices performing the task as cameras move around an area. For a single headset, this may be a relatively slow process, but performing the same task using multiple devices can both be beneficial and create its own problems.