Reddit gives credit to this youtuber, that in the past has leaked some Nintendo things including Metroid Dread
https://twitter.com/NWeedle/status/1266833951898906632?s=20
Translation
"Leak Express: New Metroid 2D for Switch could be "Metroid Dread"
It would be the sequel to Fusion.
This game...
I think that a new Zelda is years away, but the Switch’s successor will come out next year or early 2025 at the latest.
I do expect Mario Kart 9 and a new 3D Mario at launch.
I think they’ll release a Tears of the Kingdom “Deluxe” a few months later (similar to what they did with Mario Kart 8 on the Switch). Enough people want a higher-res TotK that it’s worth making, but banking on an upscaled port as a launch title isn’t something they’d do.