I mean we don't even know if this is going to come out in 2020, so worrying about what it will support doesn't make much sense. We could be 2 years away from it, and the current HDMI situation won't last past this year.
HDMI 2.1 is still very new and not even all TV manufacturers are including it on ANY TVs, for example no Panasonic OLED TV will have it despite being much more expensive than LG TVs. That's probably due to manufacturing logistics, just about every industry analyst and media person was certain we wouldn't get HDMI 2.1 this year because it was too soon after testing requirements were finished and published for the spec. And yet here we are. It's entirely possible that you can't even order HDMI 2.1 silicon unless you want ten million of them.
We don't have video cards that support it either, those probably won't arrive until 2020 either. So...
HDMI 2.1 is still very new and not even all TV manufacturers are including it on ANY TVs, for example no Panasonic OLED TV will have it despite being much more expensive than LG TVs. That's probably due to manufacturing logistics, just about every industry analyst and media person was certain we wouldn't get HDMI 2.1 this year because it was too soon after testing requirements were finished and published for the spec. And yet here we are. It's entirely possible that you can't even order HDMI 2.1 silicon unless you want ten million of them.
We don't have video cards that support it either, those probably won't arrive until 2020 either. So...