Ultra HD Forum

[2] On July 21, 2015, the Ultra HD Forum announced that they had over 20 member companies after incorporating as a US-based non-profit a month earlier.

[3] On April 18, 2016, the Ultra HD Forum announced industry guidelines for UHD Phase A content.

[4] On January 5, 2017, the Ultra HD Forum announced that their guidelines had been updated to version 1.2 (including things like immersive audio, BT.2100, etc.)

2100 1080p content with Wide Color Gamut (BT.2020) and High Dynamic Range as Ultra HD service.

Broadcasters are advised to provide backward compatibility by using HLG10 with BT.2020 color space, or simulcasting PQ10 or HDR10 streams (for example, using Scalable HEVC).