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Yes, DCI-P3 is the film industry standard and is part of the UHD specification.

Right, the article even mentions this:

> DCI-P3 will be the gamut to have when UltraHD content rolls around, and Apple choosing it instead of Adobe RGB was a well planned move.

No, broadcast and Blu-ray 4k specs specify the BT.2020 color space. Of course, you could argue that neither of those are relevant to an iPad.

The UHD spec supports both P3 and Rec.2020. With SMPTE ST-2084, it's thankfully not an issue at all.