Reasonable guess. I'm guessing $899 myself though.
$599 - M2 8 GB / 256 GB
$899 - M4 16 GB / 512 GB
Currently an M2 Mini specced up to 16/512 would cost you $999
The 16/256 (most likely the entry SKU if Apple indeed decide that 16Gb is minimum SKU going forwards) would cost you $799. Based entirely on Apple adopting the M2 price scheme for the M4 Mini.
The difference here is that without an 8Gb SKU Apple would not be able to offer a $599 price point.
And therefore continuing the M2 Mini (until a point when they decide to quietly drop it) at $599 in the Apple Store (they did this with the 2012 non retina MacBook Pro I believe) - or leave it entirely to third party retailers - seems like the way ahead.
A more recent example would include the M1 MacBook Air which you can still pick up brand new at third party retailers in the UK - although they are now starting to get marked up as clearance (and I bet the likes of Best Buy in the US) despite the M2 Air being launched and getting a price cut in the interim followed by the M3 launch which I am sure they'll just quietly allow to disappear.
Based on this, it might be reasonable to assume that Apple might actually officially discontinue the M2 Mini so they can't a deadline on official support, but allow third party retailers to continue to sell it for an unspecified length of time - the M1 MacBook Air has had an incredible run at third party retailers. The M2 might get as good a run if Apple decide the M3 is going to die out fast because they don't want to keep ordering M3 CPUs on the expensive N3B process to make them.
If the base M4 Mini starts with 16/512GB, then would the Pro move up from the M3's 18GB/512GB starting point?
Could we see a binned model with 24GB or even (unlikely!) 36GB RAM ?
The Mini Pro quickly loses its value proposition once you upgrade the RAM and CPU/GPU cores, so I'm curious how the binned M4 Pro will compare to the current M2 Max Studio in price and specs.
An M4 Pro Mini with 24GB/1TB and the binned CPU for $1500-1700 could be a sweet spot. I suspect the M4 Max Studio will see a price increase next year.
I assumed base M4 mini to be 16/256 - $799 starting price. There's room then for a 16/512 SKU above that for $999
It would not impinge on an M4 Pro 16/512 which would remain a $1299 SKU.
Anyone looking for cheaper might then be offered the old M2 Mini at third party retailers starting at $599, Apple could allow pre-upgraded SKUs of what remains into the channel for a limited time for people who really want those.
I recall reading about the difference between the M2 Pro and M3 Pro not being all that great, the smaller process majors on energy efficiency which would be good for cooling in a smaller case.
Performance isn't necessarily going to be a massive uplift on M2 Pro in that case if they are optimising for M4 and M4 Pro laptops and want power/heat savings. M4 Max when it comes would be the flagship for the Mac Studio and they'll want to keep that strong.
I'd like to think that wise money purchasers would look out for deals on M2 Max Studios up against upgraded M4 Minis - I know that Costco in the UK seemed to have deals for £1299 M1 Max Studios only a few months ago (the M2 Max Mac Studio had been launched by that point) - outstanding value if you needed something because it was essentially price rivalling an M2 Pro Mini but with double the RAM, more Thunderbolt ports, and double the encoders/decoders. The main drawback being probably fewer years support and perhaps AV1 hardware decode and M4 latest generation having better single core performance - admitted quite a strong point there.
If there comes a time where you're comparing a discount M2 Max Mac Studio from Costco with an M4 Pro Mac mini from Apple - at the same price - what would you pick?
I don't see how M4 Max Mac Studio would get a price increase due to the way Apple prices their hardware - they'd always try and use existing price points and keep them for the lifetime of the product. Only a material change in spec (like potentially going to 16Gb for the new mini) would affect retail price in my opinion and even there Apple are likely changing the form factor in part to make it look like a new product - they might even choose this time to call it a new product so they can untie the old Mini price points from the new product.
I've likely been saying Mac Nano for years at this point
With a completely new product they can hand wave away any perceived lack of ports between that and a Mini because they are different products. This would work best for Apple if they officially discontinue the Mini - but they can let third party continue to sell M2 SKUs with discounts at key times of year 'while stocks last' - might be years going by the M1 Air.
So we potentially have 3 or 5 USB-C ports, with the front 2 being USB-C on M4 Mini and both of them being Thunderbolt on the M4 Pro (with 3 Thunderbolt ports at the back on both models. And because it's a 'Nano' and not a 'Mini' no direct comparison can be made between the two products, especially if Apple don't have to make that comparison because they don't sell the Mini any more.