4.0.1, Pre Cataclysm patch

the first two expansions brought in new continents, outlands and northland, so players without the expanions could not travel to the new lands. As for cata i believe the old world will be phased into the cata zone for those with cata and stay old world for those without. Expansions do not cause you to start over, just to progress further.

All this while having to own the first WoW? Or can you get all the content from previous versions from Cataclysm, cause if not, that's what? 20+30+40+40=130$ +monthly charge? That's... pretty steep, if that were the case. >.>

EDIT: Finally used the demo that's been on my PC for forever, so I've been a little interested.