Yes, Casy has a documentary he's shooting, about the singing career of a certain "former" actor no less, as The Hollywood Reporter states:
Casey Affleck will track the musical career of Joaquin Phoenix behind the lens of a camera.Affleck is directing a documentary feature on Phoenix, his friend and fellow actor who last spring decided to swap the thespian business for a musical one.Phoenix is embarking on a new path as a rapper, with an album to be produced by Sean Combs. He is scheduled to make his first public performance Friday at a Las Vegas club, which will officially kick off Affleck's shoot. Affleck, repped by Endeavor and Brillstein Entertainment Partners, is known for his work in front of the camera with such movies as "Gone Baby Gone" and the "Ocean's Eleven" series. He directed a series of shorts for Sundance Channel in the late 1990s.
-I'll see it, what about you?