The things that excites me most about cataclysm:
The first thing I ever saw was of course the trailer, the barrens being split in two, later came a lot of info about quests each seeming more awesome than the next, making me squee like a little kid, I simply couldn’t hold it in and was running around in my room… though that was also due to the fact that Horde got goblins… And goblins always been one of my favourite races, when I later saw a bit about their starting races I nearly creamed my pants over the awesomeness, I always loved these ‘natury’ zones which wasn’t TOO naturisticky, and goblins made it perfect.
Now all the races aside, I LOVE the look of guild interface/levelling, and I would LOVE to try it out, its very exciting since I always loved the idea of the major guilds levelling faster (top 5/10 get picked, but more people = more chance of higher total xp). So it might keep people from making their own new guild as it would be better to join a major guild, which would make it so there’s fewer but easier to remember guilds and more raidspots (or 5 man HC spots in cataclysm :3).
But the one true thing im the very most excited about, is plainly the mix of quests, zone looks, flying around and such. I always loved flying around watching beautiful areas instead of travelling by a normal flying route, and being able to soar in the sky while I can watch down in awe, and land if I want… That is what excites me the most, being free in a place im used to be locked down in.