In 2009, director Joe Johnston had this to say about the future of the franchise : "Well, there is a great story for the fourth one that I would be interested in getting involved with and it’s nothing like the first three. It sort of takes the franchise off in a completely different direction, which is the only way I would want to get involved." Since then, however, nothing else happened. The project seemed dead in the water. In the same interview, Johnston also mentioned that they might even push for a second trilogy, one that would deal with a completely different storyline.
On the other hand, when asked about Jurassic Park about a month ago, Sam Neill had this to say : "I think we’ve told the story. I think it’s done… Stan Winston who made those beautiful dinosaurs died. So, no Stan, no ‘Jurassic Park’ really … [and author Michael] Crichton died too".