X based on what I've seen, but I doubt it will be a 2014 release in the West.
Super Smash Bros 4 based on what I expect to see, bu I admit that the game is a a bit short of what I'm hoping for at the moment. Needs more characters, stages, modes, tweaks, etc.
Mario Kart 8 is on the top for me based on both known quantities and what I expect to come in 2014. It looks to be the best entry in series history, even though the 12 player cap rather than 8 players worries me after the Wii iteration.
Love and tolerate.