AMD X670 and X670E were launched in September 2022.
X670 and X670E have the same specifications except for access to PCIe 5.0 lanes on the processor.
X670 allows access to eight PCIE 5.0 lanes on NVMe slots whilst the rest of the lanes on PCIe card slots (for GPUs, etc.) are dropped to PCIe 4.0.
X670E (E for "Extreme") guarantees all 24 PCIe 5.0 lanes on the processor are shared across accessible ports: 2 x PCIe 5.0 x4 for NVMe slots + 1 x PCIe 5.0 x16.
All other ports are available via the chipset.
X670 and X670E use two Promontory 21 chipsets.
The processor provides PCIe 4.0 x4 to the chipset.
X670 and X670E provide PCIe 4.0 x12 + PCIe 3.0 x8.
X670X could change the X670 and X670E's PCIe 4.0 x12 + PCIe 3.0 x8 into PCIe 4.0 x16 because PCIe 3.0 x8 = PCIe 4.0 x4.
X670X could drop all USB 2.0 and 3.2 in favour of USB 4.0 or Thunderbolt 4 with DisplayPort links.
Taking this further, an AMD Ryzen 9 7950X3D with two CIOD3 I/O chips would be incredible allowing for two X670X chipsets.