Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Roku never seems to announce in advance any future updates. I've seen posts that a few Roku players in the UK have been successful displaying HLG, but only with UK specific channels and never on a box outside the UK. Makes me think it might become available at a later time, but we'll never know until it happens.
Dan Nvidia Shield, Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.