Here is why it's not worth it!
Home cinema manufacturers have been rushing to release new AV receivers with 4K capable HDMIs, yet only one AVR brand has implemented HDCP 2.2 and that's Onkyo. Five of its new receivers, plus one processor, offer the copy protection, albeit on a single HDMI (STB/DVR).
The chipset used is the Silicon Image SiL9679, currently the only solution available to any equipment manufacturer. The catch is that the SiL9679 doesn't support the full 4K 4:4:4: colour space; it's a compromise 4:2:0 solution, created for deployment in UHD displays.
This, I was told by representatives of both Yamaha and Denon is why their AV receivers don't implement the SI solution: 'We want to offer our customers the ultimate 4K experience," they told me as if one "and that means ensuring our 4K HDMI products support the full 4:4:4 colourspace."
The message to buyers is that they can be future-proofed with Onkyo, but possibly sacrifice some colour fidelity - or gamble with its rivals and potentially revel in all the colours that technology allows (just for fun let's assume that we'll be able to tell the difference between 4:4:4 and 4:2:0).
Of course the usual 4K caveats apply. There is no 4:4:4: UHD content available (maybe Blu-ray 4K discs will offer it, if studios ever agree to launch them). Panasonic's DMC-GH4 system camera shoots 4:2:4
So in addition none of the gear today has 10 bit color or any of the new 4K specs with improved color, and contrast ratios.
To crown it all these projector are twice the price in the US vs prices in JAPAN