Based on reports from customers who have been contacted by system builders, Microsoft is planning to change the way it licenses Windows 10 going forward. Instead of letting the OEM decide which SKUs get which version, it will be based on the processor inside the machine. For a system with four or fewer cores, a Windows license is expected to increase $70. For a machine with more than four cores, Microsoft is looking at a $230 price increase for the manufacturer. The OEM could choose to swallow that cost, but with margins as low as they are on PCs, that seems unlikely.
The extreme end yes, what would now be called HEDT, but those would not be found in the bulk of even higher end OEM systems, namely because they cost an arm, a leg, and a few toes. Starting with Coffee Lake all non mobile i7 processors are at least 6 cores, meaning quite a number of consumer level OEM systems will be affected.