(i think usb 4 is gonna be 60gps...wowser.)
It's 40, same as Thunderbolt 3 but does not need to be certified by Intel which means that you are at the mercy of whatever components are being used. This is already an issue as many are finding out. Thunderbolt is rock solid by comparison. Thunderbolt 4 allows multiple TB3 devices on one port through a hub or daisy-chain and brings other TB3 features to Windows. So called "thunderbolt compatible" is a marketing term and means nothing.
USB 4.1 is expected to be 80Gb/s but the spec is just now being proposed. It's not expected to be finished till mid-'23 and nothing will likely ship before 2024.