I completely disagree with the hand gestures. Just having users accept wearing Glass is enough of a challenge without insinuating that the UI will require you to look like you're doing panotomimes in public.
And this is coming from someone who is dying to buy Google Glass! (mainly for the hands-free camera feature)
Those gestures could be substituted by eye tracking. In Kinect UIs, menu buttons are often activated by holding your hand to the specified position for a certain amount of time. This can be translated to directly looking at an element for some couple hundred milliseconds.
And this is coming from someone who is dying to buy Google Glass! (mainly for the hands-free camera feature)