Besides Cataclysm, this is the upcoming MMO I’m looking forward to most. Even more than Star Wars: The Old Republic. If Guild Wars 2 is what the devs are saying it will be, with customisable personal storylines and a dynamic world that changes based on your actions, I think it will be amazing.
But my biggest fear is that they are overpromising and what comes out will in no way be as cool as it sounds. Kind of how like FFXIV sounded like it was going to be something revolutionary, but now looks to be more like FFXI v2.