Rocket Lake-S is expected to feature Cypress Cove cores in combination with Xe-based Gen12 graphics. You will get up to eight cores (which is less than the max of Comet Lake-S), DDR4 memory support, and PCI Express 4.0.
Another rumor is that Intel is prepping Z590 or B560 series chipsets, and that the B560 series will get memory overclocking support. This feature was previously exclusive to the Zx70/Zx90 series chipsets.