Regarding many of the sets shown only supporting 4:2:0 subsampling @4K60, that's no longer looking to be a choice by the manufacturers.
For anyone that's been paying attention to the receiver market, you know there's a limitation in the current HDMI repeater boards where you have to choose either full-bandwidth (18gbps) HDMI 2.0
without HDCP 2.2, or partial-bandwidth 2.0 with HDCP 2.2 support. It's looking like the same issue exists in HDMI Rx hardware at this point.
It's unclear whether Silicon Image has solved the issue and this is simply due to design lead times, or whether they're still having fabrication issues. What's disturbing here though is it seems to imply HDCP 2.2 has sufficient overhead that it's actually eating bandwidth at the clock rates they can currently produce? This is why DRM sucks. HDCP has always been riddled with problems, but it looks like beyond new handshaking issues that are likely to rear their head from the new spec, we even have performance concerns. :\
Obviously from a television manufacturer point of view, they have to take the lesser of two evils here - no way they can risk content literally not being displayable on their sets. Better to choose reduced feature support that may or may not be mainstream in the life of the set. Either way, it looks like for this year ... full spec HDMI 2.0 will be few and far between, if available at all.
Side note, Scott Wilkinson is planning to discuss this with Silicon Image (I assume he means while at CES), so hopefully we'll get some more info.
http://www.avsforum.com/forum/166-l...hdtv-offerings-ces-2015-a-2.html#post30564849