The USB4 specification was officially released last September with the new standard promising speeds of up to 40 Gbps and up to 100 Watts power delivery over USB-C connectors.
MMCI is now offering a 2:1 USB4 switch, the first computer-controlled USB4 mux according to the company, that can control 1 or 2 products up to 20 Gbps. Model 3141 USB4 Switch is not designed for consumers, as there aren't any USB4 devices around at this time, but for electronics designers, firmware and software developers to enable them to test & debug their USB4 implementations.
MCCI Model 3141 USB4 Switch