“They will offer four additional PCIe 5.0 lanes for storage, and a PCIe 4.0 x 4 interface for the slower standard. While the chipset omits PCIe 3.0 support, that’s unlikely to bother anybody and the new configuration allows computer makers to avoid sacrificing PCIe 5.0 lanes for GPUs and storage.

The LGA-1851 platform also abandons support for DDR4 memory”

https://www.tomshardware.com/pc-components/cpus/leaked-intel-arrow-lake-chipset-diagram-show-more-pcie-lanes-no-support-for-ddr4-new-chipset-boasts-two-m2-ssd-ports-connected-directly-to-cpu