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The HDMI Forum rejected AMD's open source HDMI 2.1 implementation
(www.gamingonlinux.com)
This is a most excellent place for technology news and articles.
Audio? Forgive my ignorance, It is out of actual ignorance or rather lack of knowledge
Naah, DisplayPort carries everything from audio, USB, displays, etc. Version 1.2 even allows daisy chaining displays, so you don't have to have number of cables going to your PC. When it comes to audio, version 1.4 supports 1536 kHz maximum sample rate at 24bits and supports 32 individual audio channels. Scary good! Overall it's significantly better protocol.
DisplayPort supports audio.
I'm more recent implantations of DP have audio