Yes, and this is 99.99% going to happen. I remember reading a blue post about the next expansion being truly different, bold, and amazing. Also, they even stated at Blizzcon 2008 that the 3rd WoW expansion was going to be different and big and bold. Deal with it, having different race/class combos isn't going to ruin the fcking game, you idiots say something will ruin the game every expansion. Well, your still subscribing aren't you? Face it, it's an MMO, it's going to change and evolve. Plus, vanilla WoW zones are EXTREMELY outdated and shitty looking. They were made as early as 2003. Why wouldn't you want a revamp? Plus, cataclysm is going to be taking place in the middle of an epic story where what you do actually means something. Sounds good to me, oh and BTW, I'm not a stupid 10 year old. I'm 16 and have been playing since patch 1.11. Stop making assumptions that everyone who enjoys this game is a little kid.
P.S. Enough with the QQ, just enjoy the game! And if you don't there's plenty of other games to play and QQ on forums about, lol.