Google's descriptions are rather tame, compared to what i've heard. But, if you're an Explorer, as Google calls it, these guidelines are probably helpful.

Our Glass Explorer community, which consists of people from all walks of life, actively participates in shaping the future of Glass. With new technology comes new questions, and our Explorers help to answer those questions. The first Explorers were developers from Google I/O 2012 and people who told us what they would do #ifihadglass. Since then, we've continued to expand the Explorer Program. We’re at the start of a long journey and we’re looking to our Explorers to help us develop this new technology.
Since the program started, our Explorers have gotten a lot of attention when they wear Glass out and about. Reactions range from the curious – “Wow! Are those the ‘Google glasses’? How do they work?” – to the suspect – “Goodness gracious do those things see into my soul?!” Luckily as the Explorer Community grows, so does their collective wisdom. We asked some long-time Explorers for their advice,...Google Publishes Glass Do's and Don'ts To Avoid Bad Reactions [sites.google.com]

Earlier stories

California Driver Ticket For Wearing Google Glass [webmasterworld.com]
Google Glass Worn by a Stranger: How Will You React To An Approach? [webmasterworld.com]
Google Glass Story That's Hard To Believe [webmasterworld.com]