The Guild Wars 2 team has posted a two part series of presentations given by Daniel Dociu at this year's Game Developers' Conference a couple of weeks ago. Grab the link below:
Part 2 of the concept art video our Art Director Daniel Dociu used for his presentation at GDC 2010.
Concept art is from Guild Wars and Guild Wars 2.
Check out the official ArenaNet YouTube channel to view the videos.