I personally can't wait to see the teardown.
As for the bolded,its my understanding that it would be nigh impossible for the PS5 to overheat or the fans ever get louder than a certain threshold.
Remember, Fixed power, variable-frequency.
So basically the PS5 has a peak APU power draw limit. Let's call that 250W. It would never draw more than 250W for the APU, and if some code is threatening to push the processor to a point where it would need to draw more power, it would rather downclock the CPU/GPU to stay within the power limit. This basically means that sony would have designed their cooler to accommodate for a 250W TDP. If their cooler would keep that chip cool at a steady 65C for example, the PS5 would never be hotter than that by more than a few degrees, and that would have more to do with your ambient room temperature than the console itself.
At least, this is my understanding of the tech.
I tend to think it's going to look quite a bit different than the way the PS3 and PS4 internals are laid out.
That's what I meant by, "even then, it should be very reasonably quiet". Early games shouldn't push the system as hard, but even when stressed, more so later on, it shouldn't be a significant change to the cooling systems operation. If our understandings of the design are correct of course.