You cannot really do full-speed PCIe buses on cable ports. I expect that Intel will do what AMD and Nvidia are doing presently with GPUs, and what they used to

You cannot really do full-speed PCIe buses on cable ports. I expect that Intel will do what AMD and Nvidia are doing presently with GPUs, and what they used to do with their chipsets: Sell the CPUs into the various motherboard manufacturers, and let them sell the complete package to the consumer. They can implement any form factors they like. Of course with a sufficiently punitive contract that Intel retains control of everything.