There have been murmurs of a 4K Apple TV and even hints of 4K HDR videos on iTunes, but now we have evidence tying it all together. Remember that incredibly revealing HomePod firmware? Developer Guilherme Rambo has sifted through it to discover references to both 4K and HDR support in an upcoming Apple TV model. And the HDR support is particularly broad, too. The media player's code mentions support for Dolby Vision, HDR10 and Hybrid Log-Gamma formats, so the odds are that HDR's enhanced picture quality will be available even if your TV only has limited compatibility.