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The USB Promoter Group has pre-announced the next USB version. USB4 version 2.0 promises to deliver speeds of up to 80Gbps. That's double the 40Gbps speed of USB4 and Thunderbolt 4. The technical details are still being worked on, but some of the key characteristics include the aforementioned 80Gbps support, type-c connectors, a higher power delivery spec, backwards compatibility with previous USB and Thunderbolt 3 standards, and support for the latest DisplayPort and PCIe specs.
In a welcome move, existing 40Gbps USB cables should support up to 80Gbps transfer rates, so a good quality 40Gbps USB cable should remain perfectly viable for many years to come. Even more interesting is the claim that the new spec will allow USB3.2 devices to potentially exceed 20Gbps.