> If I were them I'd rather release information they want to the public instead of a random blogger getting a photo and kicking up a firestorm of interest.

There were rumours of these glasses in the NYT last December: http://bits.blogs.nytimes.com/2011/12/18/wearing-your-comput...

They did their best to conceal it then. It's not in Google's DNA to hide disruptive products for a long period of time.