PvE - Ritualist, Assassin
PvP - Mesmer, Ranger
I am not sold on any of the classes, but I am most looking forward to:
Ranger, Thief, Warrior and potentially the Mesmer.
I was expecting for the Assassin 2.0 to be my class of choice in GW2, but the Thief loses so many points due to the insanely limited selection of weapons that he has, that I have found myself looking at the Ranger and the Warrior more often because of it.