This idea was very well written. It was reviewed on Ain't It Cool News back in 2004 which included an in depth look at the proposed story for Jurassic Park IV. It had a majority of things that would make the fans happy, seeing Isla Nublar after all this time, having another company breeding their own dinosaurs, new characters and of course the mainland. However, while these little things were what we wanted, the main story was something that would have ruined the franchise. Genetically mutated di-hu-ogs. Dinosaur-Human-Dog. DNA from all 3 were mixed together to create mercenary dinosaurs and our main character Nick Harris was in charge of training them.

I am not too sure how far into production this script got, but I know that around this time a few freelancers were working for Hasbro to design concept art for the Jurassic Park IV toyline. Carlos Huante is the artist who designed concepts for Amblin Entertainment. I've been in contact with Carlos, and he tells me that as soon as the heads at Amblin saw the artwork, they shut down the project almost instantly.

There have been debates for years after the script review as to whether or not this idea is still being used and in a recent interview with Joe Johnston, he states that the idea was scrapped and they've moved on.

We have very little information on this script, only that it was the next script written after the above one. This is the script that producer Frank Marshall was happy with in 2006/2007 where he said multiple times that the movie will be filming in 2007 and released in 2008. Clearly, this didn't happen and I have no idea why. Laura Dern, who played Ellie Sattler in Jurassic Park, said a few times that Spielberg had phoned her up about this script and wanted to get the movie together but this also didn't happen.

This is the idea that they are running with now. It takes place on the mainland and has all new characters. Nothing more is known about this script other than the fact that it will take the franchise off in a new direction.