I would expect the iMac to offer "M1X" in the same configurations as the MacBook Pro (so 10C and 16 or 32G cores). I would not expect it to get the higher-core count models (Jade-2C and Jade-4C) that are rumored for the Apple Silicon Mac Pro.
I am guessing what might be holding it back is the display, assuming it will be MiniLED. Latest rumors are now saying the "Mac mini Pro" might also slip into 2022 so if true, I am wondering if the "MmP" is waiting for the new Apple Thunderbolt Display and this ATD will be using the same screen as the larger iMac and the display is what is pushing both back.
If true, I expect this lends greater credence to the rumors by some that the iMac and ATD will be 27-29" and not 32" (so the Pro Display XDR can remain as-is).
I am guessing what might be holding it back is the display, assuming it will be MiniLED. Latest rumors are now saying the "Mac mini Pro" might also slip into 2022 so if true, I am wondering if the "MmP" is waiting for the new Apple Thunderbolt Display and this ATD will be using the same screen as the larger iMac and the display is what is pushing both back.
If true, I expect this lends greater credence to the rumors by some that the iMac and ATD will be 27-29" and not 32" (so the Pro Display XDR can remain as-is).