I think i'd be waiting a while for that one. I think Google Glass will be scraped as its form factor is just creepy but I believe it will be miniaturised, perhaps into contact lenses.
Maybe Microsoft's API Windows Holographic will be the dominant API then and Google produces compatible contact lenses. Or maybe not.
I'm wondering when Apple will decide which technology has a chance to get copied and cleaned up for its own customers? (I have Apple products. But I'm aware that the ideas aren't coming from Apple.)