I haven't heard anything about the potential ending scene you mentioned, neiljohnson. I wouldn't be surprised if a scene such as that were included, given the extensive source material that the filmmakers have to draw from, this one film could definitely turn into Depp's next franchise. Personally, I would probably be disappointed if that did happen because I hate being set up by movies, and I despise the feeling of going into a film thinking it will be an original, enclosed story, and then coming out knowing that it was all just set up for the future. It does a severe disservice to the film as a whole, in my opinion.
What I wouldn't mind, however, is some type of allusion to [spoiler]Quentin[/spoiler] with something small that would tip off long term fans (a kind of easter egg if you will) but not something that's blatantly obvious.