HDMI 2.0b is the current "latest and greatest" -- the major issue is that the inclusion of "Hybrid Log Gamma" info -- https://www.cnet.com/how-to/what-is-hdmi-2-0b/

The "big deal" with HLG is that it allows for LIVE HDR content which is what will be needed for things like SPORTS, though given the fact that pretty much EVERY sporting event since TV has been around is massively saturated in artificial lighting I wonder if this is a misguided effort... http://www.trustedreviews.com/opinion/hybrid-log-gamma-what-is-it-2947378 That being said since HLG is an official ATSC standard it is important -- http://www.wow.com/wiki/Hybrid_Log-Gamma

Don't confuse HDMI 2.1 (which is on the horizon) for HDCP 2.2 -- basically the copy protection scheme has been around long enough (four years??) that it too is the current standard BUT there is a looming revision that could be called HDCP 2.3 -- https://www.digital-cp.com/sites/default...erReview_v1.pdf