Advertising is changing regardless of Google Glass or innovations like it.
However, having a wearable smart device capable of knowing everything you do/see/hear and (having information on those three things in addition to emails/tweets/communications) quite possibly feel means that ads will be much more tailored, and seemingly invasive.
The answer to the question “How will Google Glass change advertising”, is a question that I as an advertising professional would go about answering by asking this question: “If I had Google Glass, how would I easily find services/products/people so that my life is improved?”. If I’m traveling in a new city and wanted to find the cheapest vegan options, it would be useful to see vegan restaurants pop up in real life via Google Glass with a indication of how much they typically charge. It would be useful if I were walking down a street and was able to see if other people were interested in the same things I was, and where the nearest bar that served Fruli was located.
Unfortunately, I’m going to have to wait to see how Google Glass will completely change my life as I really don’t care to drop $1500 for a trial. I am, however, looking forward to the feedback of those who did.