Remember that "shocking" Pokémon announcement that was teased a while back? It's just been announced on NicoNico that the game in question is Pokkén Tournament, a fighting title co-developed by Bandai Namco which apparently uses the Tekken game engine. Tekken producer Katsuhiro Harada and Soul Calibur producer Masaaki Hoshino are also heavily involved.
At the moment the game is only confirmed for arcades — with a 2015 launch — but there's a chance that it could come to the Wii U later.
We'll continue to update this post the more details we have. The official Japanese site can be found here.