Interesting. Looks like its the same writers, which I'm a bit conflicted about. While I like the vibe that they went for, it's clear that with Pirates 2 and 3, the plot got away from them and they were rolling along out of control for most of those two movies, and only with difficulty pulled it into a semi-satisfying conclusion.
Of course, they were smart enough with this next one to not mess with the Orlando Bloom and Keira Knightley (or whatever their characters' names were) storyline, which was nice and finished, and went a different direction with quite a few new characters altogether. Anyway, I'm hopeful that without much of the baggage of the earlier movies, they can make something nice and fun with this again.