ummm.....it's not a biopic? Then what is it? Is it a procedural on his creative process? It looks interesting regardless. I respect his talent & intelligence but I'm not a huge fan of his music. Granted much of it goes over my head no doubt, so that could be a factor.
"Featuring never before seen footage from the Zappa vault" 0:11 seems pretty explanatory that'd it'd qualify as a documentary.
also, not sure if I care for this trend towards glory films of musicians from 50 years ago. The Bowie one looks horrible... Still wanna see London Town, if only for the mash up of the Clash with Adrian Mole