We already knew that Camelot is working on part of the games in Mario Sports Superstars, but now thanks to a tweet from the Australia rating board, we now know that Bandai Namco is working on the game as well.
Take a look below
MARIO SPORTS SUPERSTARS, Computer Games, Multi Platform, Rating: G, Author: CAMELOT AND BANDAI NAMCO STUDIOS, Publisher: NINTENDO CO., LTD.,
— AusVGClassifications (@AusVGClass) September 5, 2016