The first NYT article on Glass reported that Apple was also doing a lot of research on wearables. Predictably when they come out with whatever they do everyone will say they are "reacting to Google" but I'm sure many companies have been hard at work on this for years. If I had to bet I would bet on a startup that just takes bluetooth accessories to the next level and leverages the phone in your pocket for the connection/cpu/gpu. Bluetooth headset with a camera and custom voice control app. It's not near what Project Glass promises but you could build it today and sell millions for $99/$149.