Ugh, you forgot a link to an article and forgot the biggest thing.
Here is one article
The USB4 specification will be based on the Thunderbolt protocol that Intel has contributed to the USB Promoter Group. The new interface will use USB Type-C connectors and will maintain backwards compatibility with USB 2.0, USB 3.2, and Thunderbolt 3 interfaces. The maximum data transfer rate supported by the new USB4 interface is 40 Gbps over 40 Gbps-certified cables. Also, USB4 will support various display protocols, and power delivery.