The title of the film is Eat That Question. Rolling Stone reports that the film "will allow Frank Zappa to speak for himself through archival footage."
It is made by German filmmaker Thorsten Schütte. It will be premiered January 25th at Sundance Film Festival in Park City, Utah. This is not to be mixed up with the film that is being made by Alex Winter. Both do have support from the Zappa Family Trust, though.