Already saw part 1 this afternoon. Pity that Glenn and Martin didn't discuss 'the audio quality' for this boxset. They seem to know about everything regarding the boxset, except that topic ...
Frustrating. But hey, maybe they saved the best for last and it's in part 2.
*update:
After watching part 2 last week there was (again) no information about the source of the audio from the guys. They don't seem to care I think. The only thing that was transformed was how great the boxset is. On Amazon there are two 'unboxing' videos from Glen and Martin (for vinyl and CD) and again, no reaction, only information about artwork etc. It seems we have to wait for the release date and the community.