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Answers: Yes, at the end of #3 there was a trailer for a #4...
It had Elizabeth with a son (10 years old)... you do the math...

It followed all the credits, and yes... the fountain of youth is involved...

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I'm not really sure, but my friends say that there's always something at the end of the credits of every POTC movie. I haven't checked but maybe there's something at the end of the third...?

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I don't think so.

Maybe a movie just centered around Jack Sparrow but it wouldn't be called Pirates of the Carribean.

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Yes and it will have something to do with finding the Fountain Of Youth.

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