Meh... Actually don't mind the white bezel on the new iMac when actually using it. It it's pure white, it's fine and can be a useful reference for print and photo work. I would still prefer black. And if not black, my next choice would be 18% neutral grey, then white.
I really don't see Apple using white bezels if they include the notch. I could be wrong, but I think that would be a surprising move since most of the notch would still need to be black to obscure what's in the notch.
I predict the next MBA will have super-thin bezels just like the Pro and will have the notch. It will not have the XDR/ mini-LED backlight system with all those lighting zones and probably not the Pro-Motion 120Hz. But with the thinner bezel, will share the same 14" size as the new MBP and fit within roughly the same form factor as the current MBA. Of course it will be super thin. Won't surprise me if they ditch the tapered design or keep it, either way. I kinda like the taper when using the system, but would prefer a consistent thickness for stacking with other stuff in a bag.
...I also hope they bring back the small MacBook -- 12" equivalent. That thing was a portable dynamo. Or still is. My wife has been using her 12" i7 from 2015 as her on the go notebook for 6 years now and the poor thing is dying. We bought our daughter the M1 Air for college and my wife almost opted to get one too, but decided to wait. She'll take the new Air, but I think she dreams of another smaller one like her 12".