The tech specs page only says "HDMI port supports multichannel audio output." Not sure what all that covers, other than stereo.. but I would sure hope that by this version they've included everything you'd find in a $99 WD Media Player.
I'll let you know next week.. I ordered one last night to use as a media center front end/Plex server.
The previous model supported multi-channel audio via the HDMI but did not officially support HD audio.
However I seem to recall that XBMC for Mac had already managed to do this on the previous model Mac mini. For clarification since XBMC for Mac managed to do this it would appear the hardware already could do this but Apple have not provided built-in software support for this.
I could not find a similar statement saying Plex itself supports HD Audio bit-streaming via HDMI.
With regards to the new Mac mini I do not expect there to be any change. That is OS X itself will not support this, Plex will still not support this but I would still expect XBMC for Mac to support this.
PS. The MacBluRayPlayer I feel also does not support this.
The HD3000 graphics did not have the "protected" audio
path required for any HD audio.
When using, i.e. PowerDVD in bootcamp windows, it actually
decoded the HD audio and sent out PCM over HDMI.
On the Mac side, XBMC basically just extracted the non-HD
core from the DTS-HD, etc. and would just stream these bitstreams
over HDMI. It does not decode to multichannel. This is from
actual experience using XBMC for quite some time.
As for the HD4000, that remains to be seen whether the required
protected audio path is present on the new mini.
I've found this site here:
Maybe something like this:
Sorry about the delayed response..
I tried several of the videos from the demo site you listed and didn't have any luck getting anything other than normal Dolby and DTS sound out. So, the 2012 mini does send out enough data for my Onkyo receiver to interpret Dolby and DTS 5.1 (I only have 5.1 set up currently) but nothing ever indicated "TrueDolby" like it does when I play through the stand alone BD player.
This was done only through Plex, so if you have another piece of (free) software you'd like me to try, I'd be more than happy to test it out.
Can you try the latest XBMC for Mac? It is similar to Plex, in fact Plex was original based on XBMC but they split some time ago and each does some things better than the other.