What Im looking forward to the most is:
Auction house - The ability to place buy and sell orders are just brilliant. Im gonna make so much money!
Horizontal gear progression - Gone are the days that I HAVE to farm. Now I can farm when I want to without being undergeared the next time they add content. Im also looking forward to farming 14 sets of gear just to be able to change look more often then I change underwear.
I also hope the game will contain as much grinding as GW1. I just love farming titles and cosmetic stuff.