Google Glass was ahead of its time, for a while. They re-engineered the guts of a cellphone to fit into an eyeglass frame. The visual 'cube' that forms the display was a novelty and kept the project within the bounds of whats possible to be manufactured today.

Then Google came across a fiber optic eye-ball projector that made the Glass visual interface look like an 8-Track of the Doobie Brothers. They immediately realized this and dumped a half billion dollars on the project, Magic Leap.

http://gizmodo.com/how-magic-leap-is-secretly-creating-a-new...

Some day, Google will spring a productized version of this on the public and it'll be like nothing before, including Oculus. Its the best shot we've got at 'true' augmented reality.