Read this: HDMI 2.1 can support 10K resolution, assuming devices ever catch up

Summary: The HDMI Forum, the governing organization that creates specifications for HDMI cables, has officially released the next version of the HDMI standard HDMI 2.1. As my colleague James Vincent pointed out when he first covered the specification back in January, HDMI 2.1 is more a future-facing update than one that will directly affect current devices, seeing as we're still just starting to reach the point where 4K video is becoming commonplace, to say nothing of 8K resolution or technologies like dynamic HDR video that HDMI 2.1 in theory will be able to support. - www.theverge.com