Embedded PMP and audio capabilities

I want a Plex box that basically handles or passes through any audio format to my audio receiver. Currently it seems the most compatible is the NVIDIA Shield. I would much prefer to make my own Plex Box with an Intel NUC and Plex Media Player (PMP) Embedded. There is an ongoing thread about the functionality of this particular format of PMP, that I have been following:

I wanted to ask a Plex support member, what is the update schedule for Plex Embedded?

When the next major release of LibreElec 9 (LE9) comes out, hopefully in the middle of this year:
https://libreelec.wiki/releases
LibreELEC 9.0.x includes Kodi 18.x (mid 2018)

Will PMP Embedded get updated with it?

The reason for the question is that users are hoping that that update, LE9, will bring about better audio bitstreaming/passthrough capabilities to that platform.