What will Joss Whedon's next project really be?

Now that Joss Whedon has joined the tiny club of directors whose films have made over a billion dollars, there's tons of speculation about what's next for the no-longer-a-cult icon. People are dragging lists of Whedon's unfinished projects out of mothballs — the Guardian suggests maybe he'll decide to make a Buffy » 5/14/12 1:35pm 5/14/12 1:35pm