https://wccftech.com/intel-next-generation-optane-and-144-layer-3d-nand-pcie-gen-4-ssds-detailed/

Intel’s Non-volatile Memory Solutions Group has provided a first look at what is to come for the next generation of NAND and the 2nd generation of Optane memory. The 2nd generation Optane will be PCIe 4.0 compliant and more will be announced in June. This was stated by Rob Crooke, the director of Intel NSG, who announced that Keystone Harbor will ship out this year.

Keystone Harbor is Intel's latest SSD featuring 144-layer 3D NAND, QLC SSD. Intel also said that they will be transferring all SSDs to 144-layer NAND in 2021. Intel announced that QLC SSD shipments have surpassed 10 million units, but PLC, 5 bits per cell, technology is still under development. Intel will ship the Alder Stream Optane SSD in a single port form this year and dual-port form in 2021.