Phoenix502
Smash Ace
Quoted from the PokkenGame's discord, not sure if anyone here noticed.
Trailer video: https://www.youtube.com/watch?v=Ici0qvy4xvEa new character has been announced during the Nico Video stream today. Darkrai, as well as the previously unavailable Pokémon, Shadow Mewtwo, Garchomp and Braixen, are joining the arcade version of Pokkén on July 20th. A new mode called Mission Panel will also be added at the same time.
Nothing has been announced for the WiiU version so far, but it's safe to assume that we'll learn more about that in the coming weeks.