Terminators style glasses, have a screen built into one eye and computer hardware in the legs, transparent screens, 3G or 4G data connection and a number of sensors including motion and GPS. Maybe run Android.
interesting.. given the always-on 3G connection that is always-on on your head with rather heavy duty load (maps etc) what are they going to put in the fine print in the manual regarding RF exposure? - (you know, "SAR" etc)
http://alexbogusky.posterous.com/dont-put-your-iphone-next-to-your-head