I'm mostly excited about the overall idea of bringing a forgotten world back to life. There were so many great zones over the very first years of World of Warcraft, just imagine the time designers have put to make this world live. Unfortunately the first mini Cataclysm came with the Burning Crusade and people tend to forgot the old world, except Ironforge of course.
Now, with the help of the real Cataclysm, we will go back to give honor to the original lands of Azeroth, in a stylish and new way. I'd say this will be World of Warcraft II for many of us.
And despite the fact I'm one of the few people that only have one alt character for 5 years playing history, I'd be happy to level a new one just to enjoy what I've missed so much over the years.
Thank you.