I only see Apple doing three distinct series of desktop Macs, and two of the three are already out:
Budget option: Mac mini M1
Mid-range option: iMac M1
I wouldn't call the 24" iMac a mid-range option, it's still pretty much budget it just comes with a display. The $1499 iMac is basically the $699 Mac Mini + $800 display, which sounds about right. And you can even get it cheaper if you skip the extra ports.
While the new iMacs are pretty and quiet, they are neither very performant or, unfortunately, cheap.
It's the same price as the old 21" model, isn't it?
That doesn’t bode too well for my hopes for a larger iMac.
The larger (30" at this point) iMac will mot likely have the same pricing as the current 27" inch.
If a larger iMac comes around it will likely share the same design ethos, implying it will share SoC with a larger MBP. And cost will be significant step up.
But at the same time it ill probably split CPU/GPU into separate chips, allowing more power tuning...