Ohohoh, Eternal Crusade has caught my fancy. If I recall correctly, they are planning to be partially F2P in that you can play Orks for free. I would throw down cash if they gave me the chance to use a little lasgun and cardboard armor, however.
Most likely is EVE, followed by WoW in 2nd place.
In other games, I am patiently awaiting the next Deus Ex game to come out... Zzz...
I read the EVE chapter post but I'd like to know a bit more about what's going on.