I don't really get it. I can't see myself scanning toilet paper in the supermarket to see on which one I get the green light; also why would I dial a telephone number on my hand/wall or project the time on my wrist if I already have a mobile phone?
Maybe I missed something but I don't see myself doing any of the stuff that was presented. My best guess is that this is technically great, but they still have to find the right applications for it.
Taking a picture with your fingers as a frame is cool, but I don't see myself walking around with a webcam around my neck or on a cap...