[billbillw]

Libreelec will stay on your current kernel for the 9.0 release when ever that is going to be?
so no AMD Ryzen with vega until next wave of alphas in kodi 19?

Yes, as things stand LibreELEC 9.0 will be released with 4.14.y, as that's the current LTS kernel.

LibreELEC 10.0 will (probably) use the next LTS kernel (4.19.y, maybe 4.20.y) once it becomes available, but that kernel may not be released for another 12 months or more. Kodi 19 could be around before the next LTS is released in which case LE 10 alphas will continue with the old LTS (without support for Ryzen/Vega). 

With the release last week of Ubuntu 18.04LTS, isn't kernel 4.15.y considered current LTS? Just curious, maybe I'm not understanding the difference.