That's fair enough, and admittedly Japan is a little special as Nintendo here is publishing Rayman Legends and Lego City, which isn't true for the West. I can see a scenario where either Mario or Mario Kart slip into 2014.
Still, the Wii U line-up is looking better.
Potential latter 2013:
New Super Luigi U
Pikmin 3
The Wonderful 101
Wii Fit U
Wii Party U
Scribblenauts DC
Rayman Legends
Mario Kart
Mario Platformer
Batman Origins
Assassin's Creed 4
COD Ghosts
Lego Marvel
Wind Waker HD
Sonic: Lost World
Mario & Sonic at the Sochi Winter Olympic Games
2014/Future:
Monolith Soft's 'X'
Yarn Yoshi
Bayonetta 2
Shin Megami Tensei X Fire Emblem
Project CARS
Retro's game
Exclusive Sonic X2
Super Smash Bros. 4
Plus, there might be a Pokemon 6th Gen Battle Simulator and Wii Sports 3 and they may bring over Yakuza 1+2 HD to the West.
Don't forget about Watch Dogs and other potential games we don't know about