I bought both tracking and mixing dvd...
I will not comment on the tracking dvd because Chris already made a thread about it.
In the mixing dvd Joe describe all the processing done. From how he like his session to be preped in PT. PT and console layout...etc.
Track by track description and comment for processing (with before and after processing step by step, and also why he choose a specific piece again an other) plugin wise and hardware wise.
Many eq comment are not frequency accurate (boosting some low instead of boosting 60hz for example) but you also get HD pics of every hardware piece Joe use, same as console by bucket. So you can see everything like you have your eyes 1inch close to every knob you want.
The second part of this dvd is probably the most interesting since Joe review his mix as listening, describing his mixing choice for each section (why he panned this way, why he choose to put a wet vocal instead of dry vox...etc). From balance to panning, to fx. Basically why he choose to go this way instead of an other...etc.
And many more...
Btw if you are not familiar with 4K, don't worry. Console op manual come with all the 4k pics