A WCCFTech investigation into AIB Z590 partner boards indicates that Intel’s new platform will only support the PCIe 4.0 standard with Rocket Lake S processors. While Comet Lake S owners will be able to use Z590 boards, they’ll be missing out on this key feature that Ryzen 3000 and Ryzen 5000 parts already support.

WCCFTech recently claimed that Intel’s upcoming Z590 motherboards will not feature PCIe 4.0 support for Comet Lake S processors, limiting support for the latest PCIe standard to the upcoming Rocket Lake S lineup.
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https://www.notebookcheck.net/Comet-Lake-S-won-t-be-getting-PCIe-4-0-support-on-upcoming-Intel-Z590-motherboards.512967.0.html