@shephga
All great questions. There is a very interesting article in today's NY Times but as it is behind a paywall, you may have trouble reading it so while I provide link I will summarise a few points you might find interesting, as others might too based on questions of style and design:
http://www.nytimes.com/2013/02/21/t...to-make-its-computer-glasses-stylish.html?hpw
"The glasses reach the Internet through Wi-Fi or Bluetooth, which connects to the wireless service on a user’s cellphone. The glasses respond when a user speaks, touches the frame or moves the head."
"For Google, the glasses are a major step toward its dream of what is known as ubiquitous computing — the idea that computers and the Internet will be accessible anywhere and we can ask them to do things without lifting a finger."
"..the latest version of the glasses can provide walking and hiking directions from Google Maps, alerts from Google Now about a coming meeting or a traffic jam, and video chats from Google Hangouts."
"The glasses, which 18 months ago weighed eight pounds, are now lighter than a typical pair of sunglasses."
"In addition to considering partnering with Warby Parker, Google is doing other things to recruit the fashion-savvy, particularly women. It could open retail stores where people can try on the glasses, according to news reports. At Fashion Week last year, models wore colored versions on the runway for Diane von Furstenberg, and the designer made a behind-the-scenes video wearing the glasses."
While not addressing all your points about battery size, etc, hope this gives you a better feel for why I am excited about Glass. Google apparently working on incorporating Glass into glasses worn by people who need glasses for corrective vision too, not just for non-prescription wearers.