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So the 4 seems to bring a 40 Gbps mode but that is pretty useless as even 10 Gbps peripherals are rare (hosts, even)
More interesting would be USB speed / Displayport speed combinations. If it really is "Thunderbolt without PCIe" then that might be good for that specifically (I seemed to understand that USB C alternate mode gives you USB 2.0 data while using the high bandwidth pins for the audio/video)
Quote of the small article : "USB 4.0 doubles the maximum aggregate bandwidth and allows for multiple simultaneous data and display protocols."
So quite a big deal if using a tablet-like or ultra thin, you can get a goddamn dongle for cheaper, have it actually work and on non-Intel too (Intel will boast about their CPU/chipset lanes on new platform). If cheaper low power 20Gbps is an option that's useful too.
From a brief look at the spec, it basically is thunderbolt 3, to the extent that it specifies a couple of minor extensions on the host side that make it fully interoperable. It includes the capability to tunnel PCIe.
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