You don’t want to carry that around!
Canon shows another concept of HMD glasses at the Industrial Virtual Reality Expo. Well, actually, those are hand-held glasses, that are pretty damn bulky. But the tracking is stable (dinosaurs and copier seem to be tracked through markers, although you can see the silver ART infrared balls on some of the HMDs) and worth a look is their keying for the copier scenario: ugly on the edges, but it’s pretty nice, considering no special background color. Have a look here at youtube:
Some light-weight OLED+camera glasses would be neat, Canon! Maybe, you could cooperate with Ray Ban. :-)