Prime 4 will be a cross-gen release is what I'd guess. It will have better graphics and maybe something like a "cheap VR" (an extension of their Labo VR concept) mode on Switch 2 only but it will have the 100+ million Switch 1 userbase to help sales along. 2024 release.
If it was a Switch only game, why not at least show it today, they did show Luigi's Mansion 2 remaster and that Peach platformer as 2024 games, so it's not like they couldn't have shown a few seconds on MP4. My guess is they don't want to because it's a cross platform game.







