http://www.extremetech.com/extreme/106263-wireless-contact-lens-display-now-a-reality
One pixel resolution is not all that impressive but as a working proof of concept this is one of those: "its only a matter of time" type things.
That's pretty cool technology. I could see that easily being implemented in various HUD environments where eyewear could be cumbersome/impossible (pilot helmet, soldiers, doctors, etc)