...it has since been taken down though
It was HQ steady cam footage of the Norn starting area playing as Guardian and some highlevel gameplay playing as a Thief (new class). The thief dualwields pistols and daggers (amongst other things) and works with a 'Initiative mechanic' and has zero cooldowns on his skills. So rather than managing cooldowns, you'll have to manage Initiative points (of which you'll have approximately 10 with a reg of estimately 1 Initiative/sec).
So far only one of four videos made it to youtube. It's thief gameplay though - so that's cool. Will check youtube later for more of these and post them here.
Guess GameTrailers wasn't aware, that ArenaNet intended to unveil this stuff at PAX East next week. So all you lucky attendees, have fun playing the Norn! Come back here and write about it too - thank you very much.
Edit: Video works again (at least until it gets pulled again...)
The 4th part of the Gametrailer videos popped up too...