Yeah as mentioned Warhammer Online is coming. I've not played the beta or seen many videos for this game, but the screenshots do indeed look very much like WOW. The PVP seems interesting.
Age of Conan looks like it could be a winner.
Thing about Wow is that it has the content to beat everything and more importantly it has the polish and dedicated team behind it to keep it going, which is lacking in 50% of games released. A new MMO from Blizzard is something I'd like to see. Something fresh. Not a Diablo or Starcraft rehash, but a brand new game on the scale of WOW
Love it or hate, Wow is the king of MMO's and if you want something similiar you can get it, but it wont be as good. Too often people 'come back to wow'. If you want something different then you can say goodbye to wow and move on.