That was my reaction... about 3 to 4 years ago when I saw the Epson Moverio BT-100 engine maintenance training demonstration (https://www.youtube.com/watch?v=eVV5tUmky6c). It's not as sleek as Glass, but it's in the same spirit.
Point being that Google isn't quite breaking new ground by selling augmented reality to businesses. Rather, it seems that they're trying to make the most out their Glass product now that it tanked as a consumer product.