It will keep the USB-C connector and double bandwidth data flow.
The new standard, which will maintain the USB-C or USB Type C connector, will be backward compatible with ports and USB 3.2 and USB 2.0 devices, and can transmit information up to 40 Gbps, eight times more than ports with USB 3.0.
USB4 will use two channels and double the bandwidth to simultaneously support multiple protocols. The great advantage of this new protocol, brought from Thunderbolt, is that different devices can be linked at the same time.
For example, if there is a single port on the computer, a monitor can be connected, and the monitor can also take another cable to an external hard disk, and from that disk take out a third cable to connect another peripheral. It will also allow multiple higher resolution monitors to be connected, only occupying one port of the source machine.
The biggest problem, however, will have to look to the future with cables and connections, since in a short time we will have USB-C connectors that will be USB 3.0 (or 3.1 or 3.2) and others with USB4, while we will also continue to see USB-A (the typical USB connector) with USB 3.0.
The USB Implementers Forum is a not-for-profit organization created to promote and support the Universal Serial Bus. Its main activities are the promotion and marketing of USB, Wireless USB, USB On-The-Go, and the maintenance of the specifications, as well as a compliance program.
USB4 will also mean the end of multiple connectors like Display Port or HDMI, although it will surely be many years before this happens.
Source: John Beckerich