During this weekend's junket for The Curious Case of Benjamin Button, producers Frank Marshall and Kathleen Kennedy revealed that there are absolutely no plans for Jurassic Park 4.

"No... I don't know. You know, when Crichton passed away, I sorta felt maybe that's it. Maybe that's a sign that we don't mess with it."
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The next installment has been in development hell since 2001's Jurassic Park III, with people in and out of the project for years.