Only the MBP supports TB3 for external GPUs in the laptop line up. I'm surprised that the MB doesn't support them. That being the case, it suggests to me that the Mini wouldn't support TB3 until after the third gen rMB. So when TB3 comes to the rMB is generally the timeframe we might see a new Mini. That being said, how does the ARM Mini fit into this strategy? I think it suggests Apple's Mac strategy is a total mess.
From the official technote:
"eGPUs are supported on MacBook Pro notebooks released in 2016 and later1, iMac computers introduced in 2017 and later, and iMac Pro. Your Mac must also have macOS High Sierra 10.13.4 installed."
These devices have Thunderbolt 3 ports. The MacBook only has USB-C - not Thunderbolt 3 - and I think the reason behind this is for power conservation rather than anything else as they have been though at least 2 revisions without turning that USB-C port into a TB3 port.
The rest of the range (MBA, Mini, even the 2013 Mac Pro) are all Thunderbolt 2 because they haven't been updated.
Now they have released the macOS update that unlocks eGPU for existing users they can refine it and get it right for 10.13.5 (in time for WWDC) and with any luck a 2018 revision that will bring the TB2 machines into line.
I won't disagree that the range is a mess, but I don't think Apple can be messing with ARM Minis at this stage. They certainly can't use EGPU without PCIe lanes and Thunderbolt 3 and I can't see how they can gain that.
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