It might be a year before they launch, but a full 3-6 years before you can walk around major cities and get a full readout of information like most people are interested in.. and forget small towns. When I can walk down Younge street in Toronto and Google Glasses project the Yelp/Urbanspoon/foodcritic ratings when you look at restaurants, I'll buy a pair..
I'm excited abotu this tech i know it is not going to be full on augmented reality but it will be neat. Then again I also so not wear glasses and thanks to lasik still have 20/20 vision 10 years after getting it done. it will be neat to play with and i am hopign users get to help enter data and have a hand in molding the tech as it matures