I just read about The Banjo Project, a documentary which is in production now. According to the website for the project, Marc Fields ad Tony Trischka are collaborating; Trischka is the musical director. The film is not all bluegrass, but it is all about the banjo.
I am certainly a lover of bluegrass, but I also enjoy old time music, with the totally different style of banjo playing it encompasses. Perhaps it is the genealogist/historian in me, but this looks like a great film, and I am anxiously waiting to see the completed project.
Watch the trailer Like I did; if you like exploring history and music, you may agree.