Here's the "render by Ian" of the next iteration of Mac mini. 4 TH3/USB4 ports would be great. MagSafe is another welcome addition. Will they get HDMI 2.1 to support higher refresh rate 4K monitors for gaming ?
"The new SoC may feature “eight high-performance cores and two energy-efficient cores for a total of 10.” The current M1 chip in the Mac mini features four high-performance cores and four energy-efficient cores. With such power, this new machine will likely replace the 3.0GHz 6-core 8th-generation Intel Core i5 model.
The Mac mini’s GPU is almost certain to be integrated into the system on a chip, but it will reportedly be much more powerful than the current Mac mini’s 8-core GPU. Gurman reports that the new chip will come “in either 16 or 32 graphics core variations.”
The M1 in the Mac mini has just two RAM configurations—8GB and 16GB—while the Intel version maxes out at 64GB. Gurman says the new chips will also include up to 64GB of memory. Storage is likely to be the same, starting at 256GB and topping out at 2TB."
Michael Simon -- MacWorld
I think that it's more likely the base storage NVMe will increase to 512GB and at the top end offer either 4TB or 8TB of storage instead of 2.
I tend to doubt that Apple will offer a 64GB version of their new mini. 64GB of ram and up to 128GB will probably only come as an option with the Apple Silicon Mac Pro. If Apple makes the next Mac mini too good, there would be no reason to buy an Apple Silicon Mac Pro. Since Apple is always stingy with the base amount of ram they offer, I'd guess the next Mac Pro, ASi version, will come with 32GB of ram standard and go up to 128GB maximum.
There are few Mac users that would even need 128GB when using an Intel Based Mac. 32GB is the "sweet spot" for ram in terms of price and performance. The following video shows ram usage in Intel Macs from 2020.
Max from MaxTech YT channel claimed that M1 Macs wouldn't benefit from a 32GB ram option. I think that the M1X Macs will be able to use more than 16GB. Again, it looks like going with 32GB in an M1X MBP or mini will be the optimal amount for most Mac owners that run Pro software to get work done. Why give Apple more of your money than you need to ?