For some reason, the USB-IF (USB Implementers Forum, organization promoting and supporting the USB standard) announced during the Mobile World Congress (MWC) 2019 The new USB 3.2 protocol absorbs the previous specifications (USB 3.0 and 3.1), changing the naming of these standards which caused some confusion.
Now both USB 3.0 and 3.1 protocols should be considered as generation of USB 3.2 specification; that way the USB 3.0 becomes call USB 3.2 Gen 1, it's the USB 3.1 has been set to USB 3.2 Gen 2. Still confused? I explain.
Prior to reclassification, the USB 3.0 standard was specified as USB 3.1 Gen 1 (which supports speeds of up to 5Gb / s) and was renamed USB 3.2 Gen 1. Meanwhile, the USB 3.1 protocol, specified as 3.1 Gen 2 (which supports speeds of up to 10Gb / s) be called USB 3.2 Gen 2.
This also implied a change in the nomenclature of the standard USB 3.2 standard, which even before being released is now called USB 3.2 Gen 2 × 2. One of the reasons why this specification offers 2x the transfer speed of (current) USB 3.2 Gen 2, as explained by Tom?s Hardware.
Nevertheless, these specifications will remain physically the same, ie USB 3.2 Gen 1 and USB 3.2 Gen 2 can be connected from either the rectangular USB-A connector or the usual USB-C connector. Since USB 3.2 Gen 2 × 2 is limited to USB-C connectors only, Thunderbolt 3 remains unchanged.
Devices that will use the new USB 3.2 Gen 2 × 2 standard may (or may not) be announced later this year, launching first on high-end computers and notebooks; There is no forecast for when peripherals and other products compatible with the new protocol will be released.
It is worth noting that Apple is one of the group companies that promotes USB 3.0 family specifications, so it is highly likely that Apple will be one of the first to adopt the new standard (USB 3.2 Gen 2 × 2) in its future hardware.