This is probably a good thing, however. Think more along the lines of the head-up display on a car windshield than a fully-immersive AR experience, which will be both easier to adapt to and easier to integrate into all the activities for which humans need to retain some degree of their normal, un-augmented vision (like mostly everything). Look for more coverage on this here as Google's testing of the product matures and company execs slowly bleed out more details.