Some possible Wii U games that aren't officially revealed yet, but may be on the horizon next year:
Pokken Fighters- During a pre-Pokemon XY event this year, we got a
very, very brief teaser for a HD looking Pokemon game. Shortly after, internet sleuths dug up trademarks that suggested we could be looking at a fighting game featuring Pokemon characters, that could possibly even be a Tekken spinoff!? Anyway we haven't heard a single thing since then, but now that Pokemon fever's starting to cool down a little bit, maybe a Dec/Jan announcement for a Summer 2014 release would heat things back up.
The Third Sonic Wii U Game- When Sonic Lost World was announced, Sega revealed that it was part of a deal with Nintendo to release three Sonic games that were Wii U exclusives. Sonic Lost World was the first, Mario and Sonic 2014 was the second... but we don't know what the third one is yet. A new Sonic racing game is possible but it releasing the same year as a new Mario Kart doesn't seem like the smartest or most likely decision. It's easy to dream of something crazy like a true Sonic/Mario crossover or Sonic Adventure 3, but my guess is that it's a video game tie-in for
Sonic Boom.
