This video is unexpected! I had no idea we were getting footage of the new demo this early!
And also, the thief has been released! I can’t say I’m happy with the name. Some of its abilities are explained in this video.
Also see http://www.guildwars2guru.com/forum/gdc-2011-demo-cam-new-t13875.html for more links.
Edit: the videos/links seem to have been taken down, so you’re gonna have to wait a few days to see footage of the demo if you haven’t already.