USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

The new standard is based on Intel’s Thunderbolt protocol and supports a range of features, including data transfer rates of up to 40 Gbps, display interfaces, and power delivery. The USB4 specification will be based on the Thunderbolt protocol that Intel has contributed to the USB Promoter Group. USB 1.0
USB 2.0
USB 3.2 Gen 1
USB 3.2

Gen 2
USB 3.2

Gen Branding
–
High Mbps
480 Mbps
5 Gbps
10 Gbps
20 Gbps
40 3.0)
2014

(USB 3.1 Gen 2)
2017
2019

The contribution of the Thunderbolt 3 protocol to the USB Promoter Group essentially brings TB3 to mainstream PC platforms and enables various companies to integrate its support into their products.

Source: www.anandtech.com