Republic, I think it's time for a new game for you.
It's not just a "re-done" Azeroth. Entire zones are re-done. Look at Western Plaguelands for example. It is now a 35-40 zone. Many areas where Horde or Alliance had a base might not have it there. Or, it has been modified. Look at Zoramgar Outpost for example. It now is a real "town" with fortification and things:
http://static.mmo-champion.com/mmoc/...wpanel_061.jpg
Overall, viewing all the new zones and re-done ones, I think it will be a good expansion and it makes me want to level new characters again.