Usually, you have to wait until the DVD release before you get a director's commentary on his movie. Occasionally, just occasionally (as with Looper), you get a director's commentary at the same time as the movie is released, so you can listen to it while you're at the cinema. But often do you get the director's commentary on his or her movie before it's actually out in cinemas?
Anyway, here's Joss Whedon narrating a scene from Much Ado About Nothing. I wonder what he'll do next.