Google glass is just a bluetooth headset with a display and camera, combined with a SIRI like service.
People seem to think it's a competitor to the iPhone, but it's an ACCESSORY that needs and iPhone to connect to the network.
Worse, it has no technology (other than miniturization) that hasn't been done many times before-- I first saw a "glass" type system in the 1980s.... and that one actually had a computer on board!