In Mashable: On the basis of a patent, which we know may not mean much, but it is inevitable that we will see the capabilities integrated. " ... Google has been awarded a patent that could allow Google Glass users to unlock the screen using eye tracking. As of now, a single side swipe across the high-tech spec's touchpad unlocks the device, but if the patent is any indicator, that may soon get even easier.
In the patent filing, Google details how a moving object could appear on Glass' projected screen, sort of like a screensaver, and unlock a wearable device when eyes align with the movement. In this case, we're assuming the "wearable device" the company refers to is its own Google Glass, but it notes wearable computers can be worn "under or on top of clothing or integrated into eye glasses." ... '