Some of you are way too critical of this. They're trying something a little different with this pre-expac event and allowing players to see it over and over again if they choose via the scenario feature. Seems like a great idea to me, especially if the scenario is as fun as some of the previous pre-expac events.
And also, world changing events of certain areas where terrain and places are forever changed is a GREAT idea I have been wanting for a long time. It makes the world seem completely dynamic and ever evolving instead of the same exact place for an ENTIRE xpac no matter what quests and events you complete. I love it.