In the brief testing Austin Evans did in his YouTube video comparing the two, the new model was actually a touch quieter and a few degrees warmer. Of course that may not hold in all scenarios but it's something to note.

That's fair. I think the fan noise consideration is interesting because it's possible (depending on fan and load characteristics) to run the fan more (as in % duty on at "high" speed) and not meaningfully effect the perception enjoyment since it's often the fan noise changing (not the fan noise itself... though obviously this depends on how obnoxious the fan noise) that is annoying, not the fan noise itself.

I don't own any of these consoles, so I can't really say first hand, but for my Xbox One (the og one), I just know that I notice when the fans kick in... and then I just get absorbed into the game (and game noise).

Agreed, this would be the main concern, since it's one the things people hated about the PS4 and PS4 Pro (being really loud). I don't think Sony would want a regression there either.