What I'm hoping the story is is that it'll be a lead-in to the spellplague. You get to run around as a group of average joe adventurers, doing average joe adventures, but then suddenly you're still average joe adventurer but you're watching the world go to hell in a handbasket.
Basically, something incredibly awesome, but instead of the typical have it all happen through you, it'll happen simply around you. But I'm kind of fantasizing here.