Thanks for opening the thread with your review arsaib. I have so many things to do lately, that I find it hard to relax and write a few hours.
Haven't seen this film yet, but I believe it was part of the 11th plenum you mention, which banned around a dozen films in '66. And it is a rough-cut I believe, because Bttcher didn't get the opportunity to finish it.
Cinematographer Roland Grf whom you mention, became a director himself later in his career, and a remarkable one, judging by some recent articles I've read on his life and work. 

A lot of Defa-films that were banned and sent to the vaults, resurfaced and were even re-constructed after the fall of the Berlin Wall. There have really been great efforts to re-evaluate and explore the cinema of the GDR, thanks in large parts to the excellent work of the DEFA Foundation.