Namco Banda x Tecmo Koei?

Gaming giants Namco Bandai and Tecmo Koei, two companies with two names each  lol, have put up a site showing a countdown to a mystery game.

I honestly have no idea what this game might. The only thing I can think of is a Dynasty Warrior-esque game featuring Dragon Ball characters or maybe a Naruto x Dead or Alive fighting game? How bout you guys? Any guesses?