I was a quality control tester of this disc as well as the others.
So... on a blog that shall remain nameless there is a review of the box set - which they received for free.. I will only say that, if you come across said review, there are some things you should be aware of with regard to the DVD-A/V disc in particular.
The review says there is no Dolby (not sure why anyone in 2016 would care but I digress). There is indeed Dolby on the DVD-V portion along with DTS 96/24 and LPCM stereo. On the DVD-A portion, there is MLP Quad 4.0 and MLP 2.0 stereo along with access to the DTS 96/24 and LPCM is you so desire. I must say that this disc (IMO - YMMV) sounds far and away the best of all three quads so far. The quad and stereo are mighty clean sounding and the quad, in particular, is nice and punchy on my system. I have not heard the rest of the box set at this point.
It also goes on to say that the authoring job is one of the worst that the reviewer has ever experienced. In my opinion, the authoring is pretty straight forward. No bells or whistles but no surprises either. And the screen slides and art on the disc looks beautiful.
I do not have any direct information on the sources as I do not have the box yet. The reviewer says that there really isn't any listed within the box either. I only know what I hear and I can honestly say I like it a lot and it will now be the disc I go to to hear this masterpiece.