There have been covert cameras available for creeps for a long time. And these are a lot less noticeable than Glass... http://www.thinkgeek.com/product/f03a/
Just like I will when some stranger is pointing a mobile phone at me.
Just because it's Glass, assuming I even notice it, I won't clam up and simply think "oh well, because it's ubiquitous and cool, I'll ignore it".
But "spy cameras" with internet connection certainly exist already: http://www.3gspycams.com/3g-spy-cameras