The LGA 4677 platform will add support for PCIe 5.0 and 8-channel DDR5 RAM for the upcoming 10 nm+++ Sapphire Rapids and 7 nm Granite Rapids server-grade Xeon CPUs, which are supposed to compete with AMD's EPYC Milan and Genoa processors. The first 7 nm server CPUs from Intel are expected to launch in 2022, so desktop-grade CPUs supporting those new features will be released later on.
https://www.notebookcheck.net/Intel-s-upcoming-LGA-4667-platform-to-support-PCIe-5-0-and-DDR5-for-10-nm-and-7-nm-CPUs-launching-2021.439012.0.html
Sounds like "don't buy Intel until after 2022", or something.