For a while during the last month or so, Blizzard has slowly been adding little evens to World of Warcraft in anticipation of the game's next expansion, Cataclysm. About a week ago, the last, and biggest update occurred with the actual cataclysm taking place, thus revamping the old world content on the continents of Kalimdor and the Eastern Kingdoms. I've been spending quite a bit of time checking the stuff out both on the Horde and Alliance sides, and it's proven to be a ton of fun.
For the Alliance, I played as a dwarf paladin, and spent my time going from Red Ridge Mountains, to Duskwood, then Wetlands, Arathi Highlands, the Hinterlands, and the Western Plaguelands. The quests now are soooo much better laid out. I could absolutely steamroll through the levels hoping from one quest node to the next without needing to run back and forth very much at all. So far, my favorite quests have had to do with a rookie druid with the Cenarian Circle, a troll named Zen'kiki. His quests are hilarious, as he's trying so hard to be a druid, but keeps on making mistakes (by the end of the chain, he does find his niche though). There's also a pretty fun Rambo homage in Red Ridge, but I still like Zen'kiki better.
Horde-side, I haven't had as much time to play yet, but I'm working on a troll druid of my own at the moment. What I have noticed is that Durotar looks a lot better than it did before with it being half flooded now, and areas showing signs of vegetation and wildlife starting to take hold. The area looks a lot more alive compared to before with the desolate, rocky landscape. Also, there is a lot more new music in the Horde zones from what I've seen, which all comes to a head when entering the new, much more heavily fortified Orgrimmar.
Regardless of whether playing Horde or Alliance, the new music is probably my favorite improvement to the game. The old tracks were so boring, and lifeless compared to what is being used now. It's not just that tunes have been redone with actual symphony orchestras, but that the melodies are much more pronounced now. I really didn't like the minimalist music of old, and much prefer what I'm hearing now.
In any case, these changes in the old world are starting to get me really excited for next week when the expansion finally comes out. Can't wait!