[noggin]

Does LibreELEC on intel support HDR yet or is that still a no go?

There are some experimental builds that work on Gemini Lake devices with native HDMI 2.0 support - but they are, or were, still 8-bit (with an HDR EOTF) rather than 10-bit output (so you get HDR but may also get banding), though Rec 2020 gamut stuff is correctly handled ISTR.  There appears to be no support for 4:2:2 YCbCr output - and no support for 2160p50 and above.  There are all sorts of issues with most SoCs that use DisplayPort output with off-board DP->HDMI conversion using an LSPCon chip on the motherboard...  

More in the LibreElec thread here https://forum.libreelec.tv/thread/13738-.../?pageNo=1 (Special builds required because LibreElec nightlies and new release due are still using the older legacy X11 etc. stuff I believe, but as a result nVidia is still supported)

I'd say still a no go other than for experimenters (not hugely dissimilar to the LibreElec Raspberry Pi 4B HDR situation - though the Pi 4B doesn't have proper Rec 2020 support implemented yet either)

Pi 4B HDR stuff here in case people are interested https://forum.libreelec.tv/thread/23442-.../?pageNo=1 (NB now in the nightlies - no special builds required AIUI)

Thanks noggin.
What’s the roadmap looking like right now? Timeline?
I’m guessing it’s WIP so it means there is a roadmap and we might eventually get there but how long will that really take?
I much rather prefer the intel boxes over the arm ones.

No idea about Intel timeline - the fact they don't (or didn't) support the de-facto high quality HDMI 2.0/2.1 standard (4:2:2 YCbCr) for HDR interconnects is somewhat concerning - as 4:2:2 is the only standard that works for HDR at all 2160p frame rates from 23.976 to 60fps. (4:4:4/RGB only works for 30fps and below, 4:2:0 only for 50fps and above at HDR bit depths)

The Intel timeline is purely dependent on the Intel driver developers I think - without their updates, progress is likely to be tricky.  So far they've implemented the right route for HDR and Rec 2020 Infoframe signalling (and for CPUs that have no Windows HDR support), but other stuff like 10-bit pathways to displays, and support on LSPCon-based implementation (i.e. for CPUs without native HDMI 2.0 output) appears to be very WIP. My guess is only a relatively small number of Intel devs are working on this, possibly ad hoc.

The Pi 4B is a little less developed (no Rec 2020 signalling yet) - and the Pi Foundation has a lot to do with a relatively modest (though very skilled) number of developers - but they are getting through stuff. HD Audio has appeared, and HDR info frames.  If they can get Rec 2020 and 10-bit video paths with 12-bit 4:2:2 output at all frame rates - that will be a very good place to be. (4:2:2 12-bit output is quite important - there isn't a 10-bit variant)