If it has 'Pro' attached to that name you can easily add at least another grand to the starting price easy,
The four port 24 iMac $1499 so in the 'ballpark range' of $2,499 is pretty close to being "around $2K".
the original iMac Pro started from 4999 if I recall. 3 grand would be a bargain next to that and a move Apple would definitely make.
But that was in the context of there being a "regular" 27" iMac. The "Pro" one had to be more to clear most of the 'regular' BTO options . Also really wasn't something new sitting above the iMac Pro either ( so Apple pulled peoples into higher prices also ). So while Apple doesn't normally separate pricing gap by completely clearing above BTO zone, the top end of the non-laptop Mac market so messed up by their missteps on the Mac Pro 2013 market response , it was just way easier to take fatter profits. [ Apple also experimented a bit with the iMac Pro as that was first apperance of the SSD NAND modules and taking away nominal RAM upgrades by the users in a very high end pro product. The risk of lower sales is offset by higher margins ]
Most of that isn't here. The larger screen iMac probably has a very technological logic board and SSD. Apple is going to take the MBP 16" logic board and push it into a different form factor and re-orient the ports. ( some work , but not extra-ordinarily expensive work ) . The screen tech is new but leaving this to after get many of the kinks out with the 16" MBP.
However, if they completely skip the "regular" 27" iMac there is no 'lift' to clear from the bottom of the product placement. There is talk of Apple refreshing both the Intel Mac Pro and producing a "half sized" M-series one. That is almost the complete opposite of the 4 year old , "painted into a corner' Mac Pro 2013 situation.
More likely, Apple will be looking to push the "half sized" Mac Pro into that $4-5K zone. Decent chance they want the "iMac Pro" out of that zone to lower the fratricide between the products.
That should push iMac Pro pricing down. If the "iMac Pro" is largely a MBP 14-16" major components just rotated 90 degrees vertical then iMac Pro can bow wave off of MBP economies of scale.
If there was talk of Apple doing a "regular" 27" ( e.g., powered by M1 and non mini-LED screen , 24" like color schemes ) then there would be a push to take iMac Pro pricing a bit higher closer to $3K. While there is not "regular" 27" the 'iMac Pro' will get dragged into covering a portion of that regular role.
They significantly increased the starting price of the new MacBook Pro.
By hundreds , not thousands. The current entry 27" starts at $1,799. Pushing that up to $2,299-2,499 would be an increase. Pushing it from $1,799 to $3,299-$3,699 would likely cause a ton of blowback.
When Apple pushed the Mac Pro price up 100% ( 2,999 -> 5,999 ) there were lots of complaints from the folks who used to buy in the $2-4K zone. Lots. And that is a much smaller userbase than the entry 27" iMac are ( latter probably an order of magnitude bigger).
With the M1 Max , 64GB RAM , 4-8TB BTO options piled on this "iMac Pro" , it will be back in the old iMac Pro price range bracket. It just won't start there. if they don't cripple the thermal cooling abilities and allow for a larger logic board to host a Jade2C ( Max 2/Duo ), then they probably cover all of the old iMac Pro price range.
If it is primarily the same major components that appear in the laptops there is not going to be a ton of "value add" that Apple can use to hand waving Apple could do about why the desktop packaging of basically the exact same chips is $1-2K higher. if going to base the iMac on laptop chips then going to get coupled to laptop pricing. To a large part, it is just a bigger container of the same stuff.
Apple would need some non laptop components in this system to get some very large separation from the laptop pricing zones.