I predict Prime 4 will just be a Switch 2 title.
Likely, that's all Switch 2 will have going for it for the first year. Other than backwards compatibility, and upgraded version of games.
Now the question is will Nintendo name Switch 2 something sensible like Switch 2, or something stupid that confuses people? Did they learn their lesson with the Wii U, or has the success of the Switch made them forget how Wii was successful too before Wii U came out?
It's kind of funny to think that the Switch has been out so long, that there is a generation of kids who don't understand the concept of an upgraded generation.