The HD 7770 handles nothing about HEVC - CPU makes everything (by pure CPU power). For hardware handling HEVC you need at least RX 4xx. nVidia have no VAAPI support anymore = no support in newer Libreelec.
nVidia uses VDPAU not VAAPI. AMD was also using VDPAU but switched to VAAPI (shared with Intel). VAAPI is supported going forwards. VPDAU (and thus all the nVidia cards that depend upon it) are not supported.
Will the intel nuc8i7hvk lose support too in LE10?
No, Intel GPU devices will migrate from X11 to the next-generation Kodi-GBM video pipeline.
I lost track of AMD cards years ago so cannot comment on that model, but GTX1050 is nVidia so it will not be supported in LE10 .. or to be more specific; it will run via the nouveau driver (slowly) and you won't want to use it.
There is no logic in the LE settings add-on to fall-back and use fr_FR if fr_CA is not present so it falls back to en_GB which is the default. There is no universal approach for fall-back logic covering all languages so this is a complex topic to resolve in code; some languages are fairly simple, others are not and can be burdened with geopolitical issues. The easiest solution is to contribute an fr_CA localisation on transifex; then it will match and be used when Kodi is also set to fr_CA.
wikidevi lists devices against drivers; some of which are in-kernel and many of which are not; the list of devices with in-kernel drivers has always been a fraction of what's available in the market. There are signs of Realtek changing direction - a bunch of new drivers (for new chips) were upstreamed for Linux 5.2. Hopefully that trend continues and it results in some inexpensive and technically current options for people to purchase. Being a learned-pessimist on these things I wouldn't expect too much effort from Realtek on back-filling support for the legion of chips already shipped. The business decision on how/where to invest resources means manufacturers nearly always invest in current/future generations of hardware not previous ones.
Official images will start soon-ish.. the boot plumbing is still being investigated in a few places (not for LePotato).
What is the spidev patch?
If/when Kodi supports cross-platform upgrades we can wrap something around it.
You need to create a new driver package and compile it into a self-built image. You cannot self-install from the command line; there are deliberately no compile tools or package management in the OS.
There will be device specific audio/video configuration in guisettings.xml and Kodi binary add-ons will be compiled for the wrong CPU arch which will cause errors and maybe crashing. It's not impossible to migrate data, but the best approach will be taking a backup and then doing a manual restore of specific bits (unpack the .tar archive and move files around) not a full restore via the LE settings add-on. If you do that, you'll have issues.
Make a backup. If you don't like it, revert back.
Both error messages are harmless.
A quick peek at stats shows more active Rock64 installs than any other RK board, although the numbers aren't large enough to rule our abnormal install behaviours, e.g. it could represent more happy users than any other board, or more frustrated users repeatedly reinstalling 
99% of the time when someone complains about Krypton they're complaining about the skin change. The older Confluence skin is still actively maintained and available from the Kodi repo.
Active work in progress. Very active
Why would you expect it to, no one here is developing builds for the N2 yet.
Our single AMLG12 image now runs on both G12A and G12B hardware variants (including the N2) and in the next week a proper N2 install image will be available. It will be as non-functional as other G12 devices right now (same codebase, same things missing) but audio support will land soon which will get the ball rolling.
Have a look at unRAID .. ISTR they support LE running on their hypervisor.
None of the LE staff have touched the 3.14 kernel in some time. It's a bit like a set of sports kit that you left in a bag three months ago and if you open the bag it really stinks, so it's easiest to just leave the bag closed. Our development focus has been on the mainline kernel for some time now and once you start moving downhill off the mountain of stupid stuff the legacy kernel requires, choosing to stumble uphill again just doesn't happen.
Test LibreELEC images with KODI-18 for S9xxx has balbes150 images which are largely based on my amlogic branch in GitHub which will get merged into our main repo once Linux 5.1 drops. The mainline kernel has some feature gaps but for most use is stable and quite usable.
1080p should be fine but 4K is not possible without an OS that supports HDCP on the video pipeline. There is development in that direction for Linux on Intel hardware but exactly what hardware ends up supported and when it happens are total unknowns (not anytime soon).
