Google had a number of relevant hits within the first page:http://lmgtfy.com/?q=4k+rec.2020http://www.avsforum.com/t/1485211/are-current-4k-displays-ready-for-real-uhd-rec-2020
I think the Sony 4K sets with Triluminos will be the only ones that approach the BT.2020 colorspace just now.
I don't know that they have support for BT.2020 inputs - they may need an update, or external calibration device in-between the player and display for accurate color.
You will probably be able to calibrate JVC's projectors to the BT.2020 colorspace as well, as they typically have very wide gamuts. Probably the Mitsubishi Laservue DLPs too. (though they are not 4K) I doubt there's much else capable of it yet.
Pointer's colors and primaries are shown for different video systems.