You wanted speculation. And now you have it.
I think the iMac does need 3090 performance. To drive a 6k, 8k or 10k display.
The current iMac is 'good.' It's got a 6 year old 5k display. A 'last year mid range' gpu which cost £500. A hot running 10 core cpu. A really old design. (It 'stands' up reasonably well. But in Apple vanguard parlance...very iStale.)
So while this update is substantial and commendable by iMac standards. I'm trying to think of any way it is cutting edge?
Cooling? Design? A high Res monitor? A flagship gpu (nowhere near flagship in Ampere and RDNA2 gpu terms...). Ram is 8 gigs standard. Meh. Ports? Still TB3? PCIE? '3'? No '4' then?
I may have one. But you have to be balanced in discussion of what it is. It's the last summation of the Intel and AMD journey.
We can hope for 'moOAR' from AS. And I expect Apple to deliver it. Their destiny is now their own.
Intel iMac. It is 'now' a good overall package. And anybody coming from 2012 and needing one? Need wait no longer. Unless you're a progressional 'wait-er' like me.
I'm expecting an iMac iPad (at least in appearance...) which will punch above its weight class.
As someone who is interesting in gpu tech'. I find the lethargy in gpu tech' in the last 5 years bemusing. That's what a lack of competition gets you.
Luckily, Apple, Intel and a resurgent AMD are all getting back in the ring. Hopefully, they can chase down that 3090.
And for a far more compelling price.
...as for the dock. I like HP's keyboard dock. I'll give them a point for that.
Apple Pencil. On an Easel iMac. I don't expect the 1st AS Macs to offer touch. But I think they will come. 1st the transition. (Slimmer, cooler, faster versions of the same paradigm...)
Then the real sexy 'touch' and dramatic design stuff to make the AS 1st adopters green with envy...
Regards,
Azrael.