Mainly do we know much about it?
I'm sure someone on here said when it was shot, it was titled Behind The Beat. I know we see parts of it in BAD 25 (JGF with Stevie, IJCSLY)
It would be fantastic to see MJ at work in the studio on this masterpiece of an album. I would love the estate to release the original doc (if it exists) this year to commemorate the 30th anniversary of the album.
My last thought is what would want to see in this doc? Personally I'd love to see MJ recording the vocals on the record, also as well as that, it would priceless to have an interview with Michael talking about the tracks. That would be priceless