Cataclysm wasn't just about Deathwing, the Aspects and the Dragon Soul. It also contained a huge chunk of new lore information in the 1-to-60 zones that were revamped with the expansion's launch. Some of these areas have a lot to do with Deathwing's story, but some of them contain little stories of their own, stories that haven't been fully completed, plot elements that we may see pop up again in Mists. The revamp set out to breathe some new life into these 1-to-60 leveling zones, and it accomplished that in a major, major way.
I keep repeating myself in Know Your Lore posts and suggesting that people go play through those level 1-to-60 zones that were added in Cataclysm. But it occurred to me that while there are some really amazing zones out there, most people have no idea where to start or which ones they should really be playing through. Which zones are the best in terms of lore? Which ones are the most fun? Which ones may contain elements we may see addressed again in the upcoming expansion? Which ones absolutely should not be missed?
Let's make it a little easier for you.