I just saw "Rosabella" at the Film Forum yesterday afternoon. It is an exploration of Welles's working life during his years in Italy and shows the villa where he lived with his third wife, Paola Mori, and Beatrice when she was a child. The most interesting parts of the documentary for me were the interviews with the various Italian cameramen and film editors who worked with Welles, all of whom said that working with Welles meant putting in twenty hours a day and having no personal life or contact with one's family. Also interviewed was Prince Alessandro Tasco (not sure I spelled that right) who was probably his closest friend and gave a balanced picture of Welles's virtues along with his flaws and foibles.
I felt "Rosabella" was worth seeing for these clips alone as well as some stunning shots of Paola Mori early on in their marriage when she was a knockout. However, the documentary is all over the place, uneven and raises a number of quesitons it doesn't answer. The documentary filmmakers also seem to be working with a negative mindset about Welles rather than trying to present the material objectively.