this is the Youtube version (since some people had issues with the Game Informer player) of the video posted elsewhere on the forums, but i believe that this video should be seen as after watching a lot of press videos, people's perception of combat has been skewed some. this is probably one of the best videos showcasing GW2 available atm.
the driver is GW2 dev Jon Chapman playing with other GW2 devs Johnathan Sharp, Isaiah Cartwright and Karl
i believe that this video was taken after the CBT3 test but before the changes seen at PAX East, at least as far as i can tell due to the staff aoe skill Chaos Storm, which looked very toned down at the PAX East presentation than in this video. it is still in beta so there will be some graphical glitches, i spotted at least 3, so let's not harp on them as the devs obviously saw them.