Pokkén Tournament's official site updated with new info on the game, including a "How to Play" manual and two new assist Pokémon revealed:
Both Frogadier and Eevee have been confirmed as assist Pokémon, which was only hinted at before. There's also the manual, and it seems that the controller configuration is D-pad based instead of arcade stick based.
There's also a location test coming up this Sunday, so it'll be exciting to see what players can pull off.