Bergman + Fellini = ?

I recently found out that Bergman and Fellini wanted to make a film together. As far as I know it never came to be, but I think the thought alone is enough to make you dream. Here's a clip from a interview where Fellini gives a few clues as to what it will be about. Bergman just sits next to him and smiles. Might be a good time to learn Italian since there are no subtitles.