The PCI-SIG, the consortium that developes the PCI Express standard, has just confirmed their version 0.7 of the the PCI-Express 6.0 specification and is now released to members of the consortium. PCIe 5.0 has already been ratified and released in 2019 and PCIe 4.0 back in 2017. Continuing that cycle, the group is maintaining their goal to release the PCIe 6.0 spec by 2021.
PCI-Express 6.0 is targeting to bring data rates that doubles previous generation which is a 4x improvement over the PCIe Gen4 (4.0) standard and 8x of PCIe 3.0. PCIe 6.0 is aimed to address future devices from the enterprise and PC market. Such devices include interface devices like 800Gb/s Ethernet cards.
PCIe 6.0 devices may release around 2024-2025 but could be appearing as early as 2023, mostly focusing on demanding server applications. Consumer desktop usage may not appear until 2028 or later.