Super Smash Bros. for Wii U / 3DS.
Nothing else comes even close, unless Kingdom Hearts III, Final Fantasy XV, or Zelda Wii U somehow make it out next year (they won't).
Runner-ups:
- DKC: Tropical Freeze
- Mario Kart 8
- MGS V: Ground Zeroes
- X
EDIT: Looks like people have been adding current-gen 2014 releases as well, so I'll also include:
- Kingdom Hearts HD 2.5 ReMIX
- Final Fantasy X / X-2 HD Remaster
- Theatrhythm Final Fantasy: Curtain Call
- Kirby 3DS