It was announced alongside the introduction of Booster Pack Wave 2 that Nintendo would be bringing these new tracks for free to Mario Kart Tour, the mobile version of the track racer. These new courses won't be available on August 4, which is the date that Booster Pack Wave 2 comes to Switch, and instead will be playable at a later time. With some of the new tracks for Mario Kart 8 being taken from Mario Kart Tour, though, it seems some mobile players will already have access to part of the DLC.