well very few products are competely new designs?
i'm trying to think of popular consumer products that are 'new' in the sense that no-one has ever done something similar before -- almost every device i think of already existed in some form or another before it became popular with the masses.
When we see something become popular its usually a case of 'the right idea at the right time' - The most obvious example of this being most of Apple's more recent products - none of which were unique, they were just (arguably) better done and had that something extra that made them appealing to the broader audience and survived the push into popularity.
Also true for software, for example Angry Birds wasn't the first of its kind by any means, its just another clone.
So, that someone thought up of a google-glass-like product does not surprise me at all, after all VR headsets have been around for a long time, maybe Google is just the first to make something that will be accepted by consumers?