Was looking forward to an augmented reality demo. I thought the idea was that info was projected on the "glass". It would be cool to build a hack for a heads up display with some custom telemetry.
A cool use case is to display patient specific display on an unobtrusive heads up display mounted to the glasses rather than turning her head to look back at the monitor to see the patient's chart. I am sure this technology is possible right now but google glasses would presumably dramatically lower the price and availability.
So, this isn't pie in the sky AR but something more specific and approachable in the near term (and great for developer hacking).
I'm not bashing Google here - I really think AR will be the next big game changer in UI interactions the same way multi-touch was back in 2007, but there is honestly nothing new in that demo technology wise.