Hi Foley,, i have for 2 days playing wiht the nuc i3 kaby lake, and can confirm that Libreelec 8.0.1 works out of the box (bluetooth / network)
There is bios update from 036 to 042 (if your box is not updated) and also a hdmi firmware.
i have not tried the cec yet or audio, as I was busy messing around with hevc/x265, that do NOT work with the GPU yet, as also stated.
Can confirm that x265/hevc works under windows 10 with 4k/10 bit
I can also add , that i took my old ssd hd out from my old NUC i5 4250u, and it booted fine from the new I3, without reinstalling LE