Rumor: Mario Kart World will have a 120 FPS Mode.

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Nintendo have a track record of prioritising performance even on low power hardware; on Wii games like Mario Galaxy 1/2, Mario Kart, Prime 3, DKCR, etc were 60fps, same for MK8/3D World/Splatoon/etc on Wii U, Mario Odyssey/Splatoon 2+3/ARMS/Prime 4/etc on Switch.

As others have said, I do kinda hope some of their games aren't built with this in mind, as it would limit the scope and visuals of something like a 3D Mario, Zelda or Xenoblade for instance. I'd be fine with the latter two even being 30fps if it means we get a great looking game with huge scale and complex mechanics.