Looks like HDR10+ is not dead yet, Google Play Movies & TV is adding support for HDR10+ 4K titles later this year.
And in other standards news, looks like the HDMI forum is trying to combat shysters pushing non-compliant HDMI 2.1 cables with a mandatory certification programme.
Which won't bother you if you intend to buy a Panasonic OLED next year since it looks like they won't have it. But don't worry @sbiddle, it will still have Filmmaker mode!
The HZ2000 flagship will support Filmmaker Mode with added 'Intelligent Sensing' on top, meaning that the TV can "dynamically adjusts the picture based on ambient light levels" using the built-in light sensors.