USB 4 is official and likely to be seen in devices in the end of 2020
It will pack faster speeds and 100W charging
USB 4 uses the same dual lanel architecture as the USB 3.2
However,it doubles the individual lane transfer speeds to 20Gbps

Increasing the data transfer rate from 20Gbps to 40Gbps
However you’ll need USB 4 cables to reach these speeds
Most of the current chipsets for expansion the Snapdragon 855 don’t even support USB 3.2 so we aren’t likely to see USB 4 in smartphones until late 2020

The USB 1.0 debuted in 1995 and could transfer 12 mbps. USB 1.1 followed
In 2000 USB 2.0 is born also offering power delivery options
Later on USB flash drives debuted
In 2008 USB 3.0 debuted with transfer speeds of 5Gbps
Later on USB 3.1 came out as the upgraded version of USB 3.0
In 2014 USB-C or USB Type-C made it’s debut
In 2017 September USB 3. 2 is released and replaces the standard USB 3.1
The USB 3.2 preserved USB 3.1 superspeed and superspeed+ data modes over the USB-C connector using two-lane operation with data rates of 10 and 20 Gbps.

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