As others have said, this is probably fake.
Price wise: I can’t see Nintendo breaking the $399 barrier. Especially with the PS5 slim(ish), Series S consoles and Steam Deck targeting that price range. I think a more realistic price range considering Nintendos past and the rumored tech in this system would put it closer to $299-$349.
Release Date: It would still be too early for Nintendo to target a specific month, especially if manufacturing hasn’t started. Personally I think Nintendo will avoid the holiday season and go for a late spring / early summer release. This would also help the Switch 2 sales to not be overshadowed by the rumored PS5 Pro expected in November 2024.
Resolution: I don’t think anyone should expect native 4K out of this thing. The latest (semi credible) rumors are putting the power range around PS4 in handheld mode and perhaps near PS4 Pro in docked mode. Working with Nvidia means it should have DLSS abilities. With that in, we are probably looking at internal resolutions around the 900p-1440p range depending on the game with DLSS giving us the 4K output.
Games: This is the only part of the rumor that actually sounds somewhat reasonable but not because the rumor is credible, these things are more common sense at this point. Metroid Prime 4 has been delayed again and again. At this point it just makes sense to move development to the new system. Or maybe we get cross platform (like breath of the wild). Mario Kart also makes a ton of sense as a launch title considering we have yet to see a Mario Kart 9 and Nintendo keeps bleeding 8 Deluxe.
I wouldn’t expect any serious Switch 2 leaks until early next year.