I'm not sure. There's a big psychological difference between push and pull -- if you check your phone, then you'll pulling the information at your convenience, but if it gets pushed to you on a HUD, then that's potentially intrusive and distracting. I think the only way they could really make that work is to have a good way of telling when it's reasonable to push information to a Glass-wearer, and that's tricky. Definitely cool if they can figure it out, though.