Flatpanelshd quote from a Philips Whitepaper that the next version of the popular interface standard will be HDMI 2.1 that adds support for “dynamic metadata” for HDR.

The worrying bottom line says "It is not clear when we can expect HDMI 2.1 to debut in products and whether it will be possible to firmware upgrade current 2.0a ports in HDR-enabled TVs." which indicates how fluid specs are for current 4K/HDR TV's.... and 4K input devices.

http://www.flatpanelshd.com/news.php...ve+HDR+support