Bushiroad comes through with as few details as possible on this one
Sometimes an announcement is just that. It's a proclamation of planned existence. In this case, Bushiroad has proclaimed plans to produce a new Switch game based on The New Prince of Tennis.
Further details will have to wait until a later date.
This all comes about during The Prince of Tennis's 20th anniversary celebration, which also served up the perfect occasion to announce a brand new The Prince of Tennis II TV anime, which is currently set for sometime in 2022.