The FFC commentary at the end of III about a possible IV certainly flies in the face of Coppola's stance against such a project. He goes into plot detail with some enthusiasm. I think the rumor with DiCaprio has him playing Sonny, not Vito. I really don't see either as very viable. If DeNiro plays Vito, why not bring Bruno Kirby back as Clemenza?

While all of the FFC commentaries are fascinating, GFIII is especially so as he takes his detractors on. He (not so convincingly) defends his daughter's casting as Mary. He also does not consider GFIII as a sequel, but rather as an epilogue. A sequel would have had Michael as still vibrant and looking to expand his empire. FFC was rather looking for a story of how Michael pays for his sins. Interesting stuff.