with it being just like wotlk and BC, you were never forced to go to one zone to level, and you won't be forced in cata either. After Borean Tundra i had the option of either going to Grizzly Hills, Dragonblight, or Howling Fjord, even though natural quest flow directed me into Dragonblight. I was never forced to go there, Cataclysm will more than likely follow the same pattern.
The difference between in cata and vanilla is the thousands of quests they are adding so you are aren't forced to cross continents to find quests because thats the only place quests exist for your level.
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