jamesrt: Point being I've not got it yet; still on 1909 [or whatever it's called].
Maybe in 2021, Microsoft will make the 2020 version available to me...
Edit: Pretty sure my computer falls into this category (from https://docs.microsoft.com/en-nz/windows/release-information/status-windows-10-2004):
Errors or issues during or after updating devices with Conexant ISST audio drivers
Devices with affected Conexant ISST audio drivers might receive an error or have issues with Windows 10, version 2004.
I'd rather have a stable device than one which crashes all the time; but I'm surprised it's taking 9+ months to investigate/resolve an audio driver issue for a major chipset - how hard could it be? (Answer: Hard, obviously, because of the time it's taken, but why??)