Blizzard already stated that everyone would experience the cataclysm whether you buy the expansion or not correct? So, I'm just going to assume that along with everyone experiencing the cataclysm that all the revamped 1-60 quests come along with it. So, if that is the case.. what are we exactly going to be paying for then besides the ability to use two new races + questing at level 80-85. Also, if you don't buy the expansion right away... would you be able to travel into the new zones that are actually connected to Eastern Kingdoms/Kalimdor like Uldum, Hyjal and the Twilight Highlands? I can understand being barred access into the elemental planes and such. If you can't go in them then how do they plan on working that in? Make it have a portal similar to the Eastern Plaguelands/Ghostlands border?
Just random thoughts...