This is really awesome video...thank you for making it available. It appeals to me in that you have to keep very alert during the entire encounter. Moving, dodging, using LOS. I play tank class in the "old" model of MMOs in which grab aggro, take mob to x place (usually corner of room), turn the mob around...and everyone sits there spamming. This new style of play is what i've wanted. Boss looks at you...roll out. Boss AoEs...gtfo and move. And everyone is responsible for dps, heals, support and keeping yourself alive. This will be so much better.
Agreed as some have said...dedicating 4 hours to a dungeon run is pretty tough. Pretty much a scheduled raid instead of a 1 hr dungeon run...not sure how I feel about that.