I don't really consider this lore, so posting it here. I'm sure others probably have mentioned this around somewhere -- a friend pointed this out to me from the video:
SpoilerWe see the dragon fly by the airship at 0:33:
Do not believe this to be Zhaitan because at 0:31 (1080p full window) we see:
Two more dragons fighting what I would assume be another airship. My guess on Zhaitan is:
-these are probably minions to fight
-would be cool if they all converged to make up Zhaitan himself
In any case, Zhaitan is going to be huge -- as ANet has clued to.
Please feel free to post other interesting GW2 videos in this thread -- and interesting observations from them if any.