So exactly why should an interface that Intel created to tie their CPUs to their chipsets be public domain? Just because you think it should be???

It has been a LONG time since CPU interfaces where standardized across multiple vendors (aka: socket compatible).

This wasn't created as an open interface for the industry (like PCI or PCI Express), but was created as a closed interface between their CPUs and their chipsets. If you want to use that interface, then you have to license it.

Whether the existing license covers this new interface will be determined by the courts.

Eventually...