Got my MiBox and the first thing I wanted to test turned out to be a total success.
HDMI Audio and Analouge Output are both active at the same time.
Why? My Pioneer AVR only plays analouge sources for Zone2/Zone3 inputs.. so its required to play pandora/plex/etc throughout the house.. Just used a 3.5mm Stereo to RCA Cable
To get the same functionality out of a Nexus Player or ShieldTV required $$$ for HDMI audio splitter, cables, etc..
ps: confirmed this usb to ethernet adapter works fine: https://www.amazon.com/gp/product/B00484IEJS/
update, just for stereo sources.. When plex was playing a surround sound I got nothing out analouge out.
but thats fine, I want it for music.. might actually be good if someone stops the music and puts on a movie it wont be playing outside in my back yard..
I suspect the optical output would still work with a surround sound source, so if I really wanted to I suppose I could demux that input to stereo.. would of been nice had it done it on its own though.