Still trying to get used to HDMI 2.0b and the 4K HDR content that the standard is made for? Brace yourself for a new wrinkle: The group behind the specification announced in late November the advancement of HDMI 2.1. Many questions have arisen as a result of this announcement.
https://www.digitaltrends.com/home-theater/hdmi-explained-everything-you-need-to-know-news-specs/
https://www.digitaltrends.com/home-theater/hdmi-explained-everything-you-need-to-know-news-specs/