Rocket Lake-S is currently thought to be the code-name for those Intel chipsets that will succeed those known as Comet Lake-S. There is now more evidence that they will be compatible with the PCIe 4.0 standard. The processors may have up to 20 of these lanes.
https://www.notebookcheck.net/Intel-s-Rocket-Lake-S-will-support-PCIe-4-0-new-leak.483547.0.html