Bandai Namco Entertainment recently released Croagunk as a playable character in Pokkén Tournament arcades in Japan, and they've already revealed the game's next fighter. As expected (thanks to some code discovered in a data mine) Empoleon is headed to Pokkén Tournament. The Emperor Pokémon will be available in the arcade version of the game on December 15th, 2016. So far there's no word on a Wii U release for the upcoming character, or any of the other recently revealed new fighters.
Source: Bandai Namco Entertainment