The storyline will actually be developed and added to the game.

Talk about player interaction! Fans who attended the Designing Dynamic Events Panel at PAX got the chance to help create an event chain that will actually make its way into Guild Wars 2! Under the guidance of lore master Jeff Grubb and designers Eric Flannum and Colin Johanson, these players worked together to learn about the dynamic events system first-hand and make the best souvenir a gamer could ask for.

These fans created a storyline that revolves around saving the quaggan from the krait in the Timberline Falls area. According to the blog entry, "the event chain combined assaults on krait structures, recruiting nearby allies, forging an undersea super-weapon, hulked-out quaggan, a boss creature known (for now) as Mega Uber Shark, and much more." Keep an eye out for it once you gets your hands on the game!