Not likely but how awesome would it be?
All that inspiring music playing while you do pirate-iish stuff
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I'm not sure if Lorne Balfe is working on that game as he created the score for AC3. Hans Zimmer is more of a movie film scorer, not to mention he did Pirates of the Caribbean, which is why I'm sure you'd like him to get in on this project. I'd be interesting to see how his material would different from video game scoring.