Following the recent release of the relevant Intel+Radeon CPUs - based on Kaby Lake Refresh but called Kaby Lake G (G for Graphics) - it's clear that Apple will have an interest in 2, both of them 65w parts:
i7-8705G - 3.1GHz 4 cores, 8 threads with Vega M GL Graphics (base frequency 1.1GHz)
i5-8305G - 2.8GHz 4 cores, 8 threads, with Vega M GL Graphics (base frequency 931MHz)
Note the i5 variant keeps the extra threads (unless it's a mistake). I also note the use of 8x PCIe lanes for the GPU, leaving 8 off the CPU itself which I guess would become 2 Thunderbolt 3 ports. The motherboard would provide additional lanes to give wifi, bluetooth, more Thunderbolt 3 ports, and possibly HDMI and USB for a Mini.
These should be a shoo-in for the next 15" MacBook Pro at least at the lower end of the market and I expect the 13" variants to get the Iris Graphics versions of the U series CPUs (28w TDP) which appear to be continuing.
No prices have been dropped yet but the obvious comparison point is with the
Hades Canyon NUC that was launched at $799-$999 but with no RAM or storage or OS and carrying the prospect of being noisy under load. I did think at some point that the previous Skull Canyon NUC should be the basis of the next Mini but Apple completely swerved the Iris Pro 580 powered spec for all their Macs presumably because the future road map for Iris Pro looked bleak from Intel as very few other vendors took an interest. It would be particularly risky if Intel lost interest in supporting the GPU with driver updates down the road.
A Mac Mini based on this would need a case redesign to cool the 65w TDP parts (or Apple could ask for reduced TDP parts to fit the existing Mini case). At this stage they may have decided that a taller case (like the Time Capsule) is better for wifi reception with internal antennas. And Apple's price range would start in 4 figures and quickly climb past $2k fully specced up. In fact it starts to look like a junior Mac Pro very quickly and potentially starts to scare people off the 21.5" iMac - and why would they not simply take cheaper 65w desktop parts and add discrete mobile AMD GPU to it like they've done with the 2017 21.5" iMac anyway?
This is all rather moot because I've thought that the logical thing for Apple to do would be to put dual core Kaby Lake refresh parts with Iris Graphics into the next Mac Mini but perhaps they don't want to cannibalise potential buyers of a Mac Pro or iMac?
Suitable Kaby Lake parts (
i5-7267U 3.1GHz, 2 cores, 4 threads, Iris Graphics 650 Plus) have been in the 13" 2017 MacBook Pro since earlier in 2017. Before that it was Skylake parts with Iris Graphics 650 in October 2016 which was the obvious time for the Mini to get a bump. Next up for the 13" MacBook Pro is surely a Kaby Lake Refresh before WWDC meaning Apple could have missed 3 chances for an inexpensive spec bump of the Mini since October 2016 if they don't act again.
1. They reuse the same old case which is designed for 45w TDP parts and with an efficient cooling system should turbo for longer.
2. Prices stay in the existing range more or less.
3. They can use modern PCIe SSD and Thunderbolt 3 but might have a performance reason for wanting to make sure people who tried to connect 4k monitors weren't disappointed.
All this time the iPad line has been steadily improving and iOS CPUs for a possible low end product has been bubbling under. If this product is merely a more powerful iteration of the iPad and the Mac Mini moves up market because of it with the quad cores and Radeon graphics I'm sure there'd be plenty here who would rejoice.
More fantastically there is the prospect of Apple considering a range of devices with ARM cpus supported by an ARM version of MacOS and an ARM app store. Perhaps Meltdown had an effect on this?
Finally, I think if a case redesign is on the cards then perhaps the Mini should move upmarket by ditching the spinning hard drives altogether for PCIe SSD to allow for more flexibility in size of design - it would also allow the new APFS file system to be used more widely and perhaps allow the 21.5" iMac to start with a lower price. I think we can all bet on a very sealed unit approach to the next Mini anyway.