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...
If this was true, I wouldn’t even be mad. The jank in some games is really starting to show particularly when you switch (heh) from a current gen console running at 4K to a 1080p display res on the Switch and then the game’s res is further brought down to maintain a solid frame rate in docked mode. It’s time for a beefed up Switch.