[DenisDA]

Do you think Intel will provide some "random Indian guy" with NUC review samples & early access to their latest driver? 

Probably not, but that still does not make him an Intel employee and the source of his statement remains unclear. I'd assume that if he is actually in contact with someone at Intel then it's probably just the PR department. And when you think about that HDR processing workflows thing, this sounds more like something from a PR guy. As I said earlier to me this sounds more like the workflow in professional photography than anything video/display related. HDR workflows for professional photography will suck at any low-end platform, that's without doubt. My guess is that this is just a misunderstanding.

The statment from Ville Syrjälä about HDR on Gemini Lake sounds more realistic to me. He is working at Intel, he is a driver developer, he already has access to the hardware and he knows the full specs. So I still don't get your point, sorry.
 

Support for HDMI 2.0 a does not mean that HDR is supported. It only means the ability to output video format 2160p@60Hz. Apollo Lake plays well video format 2160p@60Hz 10 bit, but without HDR. Alas, in Gemini also does HDR as InTru 3D is a lowend product.

Well 2160p@60Hz is already supported in HDMI 2.0 even at 10 bit where HDMI 2.0a (which is newer than 2.0) means 2160p@60Hz with HDR metadata support. Apollo Lake only has HDMI 2.0 (no a), which pretty much rules out HDR support. But you are right that HDMI 2.0a does not automatically mean HDR support, it is just more likely. That's why I took this as a clou that HDR could be supported.

Still, nobody has access to Gemini Lake hardware yet, so these are all speculations. But from the links I posted above it's still looking good I think. I don't have a crystal ball handy for checking, though.   

A space in the expression "Support for HDMI 2.0 a does not mean that HDR is supported." superfluous. I meant HDMI 2.0a!!!! 
The implementation of HDMI 2.0a at the Apollo and Gemini are the same across the Converter from DisplayPort.
If you do not know, do not try to prove something