Nintendo appears to have accidentally leaked that an iconic Mario Kart track is indeed coming to Mario Kart World, despite the track not being shown in any revealed gameplay so far. Mario Kart World currently has 16 confirmed courses and seven cups in the Grand Prix mode. Despite this new leaked course's reputation, it has not been officially revealed yet, and it's one that fans are probably going to be both happy and frustrated to see.
As seen by EdwardSabaVo on X, the Korean Mario Kart World website accidentally posted an image showing Rainbow Road on the Mario Kart World map. The images on the website have since been removed, but EdwardSabaVo managed to get a screenshot of the page before it was taken down. It almost certainly looks like Rainbow Road, with a giant rainbow being surrounded by dark thundering clouds and several racetrack lines coming from the supposed Rainbow Road course, indicating this screenshot was from the in-game map or menu showing connections to other courses.
From the initially revealed Mario Kart World gameplay details, we know the game currently has three main modes of play confirmed: Grand Prix, Knockout Tour, and Free Roam. With Free Roam...