The reason the rumor is swirling is related to a service copyright that Nintendo registered in the U.S.: “cart race management and arrangement,” which obviously could refer to real-life Mario Kart.
However, there’s one important thing that we do know that’s a rumor for now: It could very well include a real-life version of Mario Kart.
Universal Studios and Nintendo have joined forces to bring the masses a Nintendo-themed part: Super Nintendo World.