Even though Mario Kart 8 Deluxe's Booster Course Pass has mitigated the need for an entirely new game for now, Mario Kart 9 seems inevitable. Mario Kart is one of Nintendo's most successful franchises, and it can't stick with Mario Kart 8 Deluxe forever, so eventually, it'll move on to a new game. That's why recent leaks about a new Mario Kart game are so tantalizing. Hearing similar information from multiple sources makes it seem likely that Mario Kart 9 is really in the works, but what it'll actually look like is uncertain. Ideally, Nintendo will bring some compelling new mechanics to the table.