Pokkén Tournament has been announced in a special NicoNico livestream. Pokkén Tournament is crossover between the Pokémon and Tekken franchises, being developed by Tekken's developer Bandai Namco Games. The game will be released in arcades in 2015.
The English Pokémon site also mentioned the announcement, and uploaded a trailer to their YouTube account for the game. The trailer mentions that it is only coming to arcades in Japan.
Bandai Namco Games, the game's developer, is currently asking for fighter suggestions. Japanese residents can Tweet at @pokken_official with the Pokémon they would like to see using the hashtag #ポッ拳 in order to make a suggestion.