These are among the sorts of Tracks that have not yet been used in the Mario Kart franchise, of which should be included in the Next Official Mario Kart game with 16 or 20 NEW Nitro and Retro Tracks for the Switch: http://aminoapps.com/p/na3etz

As you can see, they are a Casino, a Land of Giant Objects similar to W4 of SMB3, a Sawmill, a Theme Park, a Non-Rainbow Road Track with a Space Theme, and a Land of Paint. Those are the sorts of new tracks that Mario Kart 9 should have to offer along with the usual basics (Mario Circuit, Bowser's Castle, Rainbow Road, a Hazard Free Track to start things off, a Beach themed Track, a Snow themed Track, a Desert Themed track, and a Ghost Themed Track (PS the Snow and Ghost tracks for one should contain Glacier and Cemetery for a first in their Respective Names come Mario Kart 9)).