1st question > the C2 is in the LibreELEC official GitHub code Repo for LE 8.x & Kodi Krypton.
There are a bunch of LibreELEC and HardKernel developers adding all sorts of mods and additions to it as there are some pretty switched on Linux u-boot and Kernel developer guys over on the HK forums.
The C2 LE developers (Raybuntu and gda) also do a lot of work with AMLogic HDMI CEC which then spreads to other AML platforms. In fact out of all the AMLogic S905 platforms I distribute LE 7.x versions for, their C2 AML HDMI CEC implementation is the best. u-boot also play a plays here.
https://github.com/LibreELEC/LibreELEC.t...r/projects
In short the C2 is not going anywhere soon, especially once Kwiboo finalises merging a common linux-amlogic S905 Kernel that WeTek devices will also be using for LE as well.
2nd question > Yes you can order direct from HardKernel, which takes a while. Especially if you choose cheap shipping. Or there are re-distributors:
http://www.hardkernel.com/main/distributor.php
What I do like about the C2, is Lirc works properly to easily custom program any IR remote. MCE remotes also work out out the box.
I suppose the only thing the AML S905 devices cannot do is HDR10 video output, but there is bugger all HDR10 content around, and the standards are still yet to be finalised anyway. I personally would not be chaining my horse to any HDR10 wagon yet, especially with Dolbyvision siting on the sidelines as well.