Story and screenplay are still in development
SpielbergFilms.com has debunked the rumors that casting has started for Jurassic Park 4, but did confirm the project is still in development. Here’s a clip from the site’s report:
Steven Spielbergâs personal reps at Amblin Entertainment (co-producers of the “Jurassic Park” franchise) have told SpielbergFilms.com that casting has not commenced on the film, as the story and screenplay are still in development.
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Source: SpielbergFilms.com