I connect my Mac to my 2K monitor and my 4K TV with HDMI, and it works the same exact way as if I'd used DisplayPort... if the TV even had DP input. I don't care about supporting the theoretical 8K monitor I may have some day.HDMI is the new VGA DSUB. It's the lowest common denominator, and it sucks balls compared to the alternatives. No one smart chooses it if they have another choice.
If you want to see what future HDMI versions will support, look at what DisplayPort supports now, and then keep in mind that pretty much every part of the HDMI spec is optional, so manufacturers are free to avoid whichever bits they want and still claim it's "HDMI 2.1".
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