What sort of "finale" does the concept need, exactly?
oops i spelled finale wrong...
a finale for Jurassic Park would be one the closes the series with a happy and satisfying ending. The Lost World did this becuase it was the original ending for the series but then Jurassic Park 3 was made, and left the viewers unsatisfied. The reason why is that it didn't have the things that the fans wanted and it was simply not "epic enough"
Becuase I'm part of the fan base and I'm a member of several fan sites for Jurassic Park, here is the thing that the fans would be happy with for a JP4.
1. Carnotaurus-
this dinosaur was not in TLW which upset many fans. They hoped for it in the third film but it wasn't in that film. It is a favorite among many fans are their favorite dinosaur from the novels. A few scenes which a chameleon Carnotaur would be just plain awesome. In the second novel, the Carnotaur had the camouflage ability of a chameleon.
2. Dilophosaurus-
This dinosaur was only in the first movie, but the fans think it's underused. A return would make some nice nostalgic scenes in a new film
3. Return of the past characters-
many fans want JP4 to have the original main characters of the first movie: Alan Grant, Ellie Sattler, an Ian Malcolm. Fans would also like to see a return of Lex and Tim Murphy, the kids from the first film.
4. Richard Levine-
a character from TLW novel. he is a favorite among the fans yet the didn't use him in the movie. Instead, the split Richard Levine into two different characters; Sarah Harding and Nick Van Owen. Harding was in the book but wasn't a paleontologist like in the movie.
5. A clear explanation-
the fans want the movie to explain what happened to Isla Nublar (which TLW did, but it was in a deleted scene) and a clear explanation of what Isla Sorna is like after JP3.
6. Mainland-
something that i don't want but many people do. They want dinosaurs on the mainland and InGen or some other genetic company trying to rebuild that park. i don't like the idea becuase it's really close to TLW movie.
7. T-Rex Revenge-
most fans hate the fact that spinosaurus won and that the T-Rex was never seen again. It would be awesome to see a rematch where the Rex wins. this is something that would make me really happy in a JP4.
8. Government Conspiracy-
a lot of people want a JP4 to be more global and "epic." they want some sort of mystery or conspiracy between InGen and the company that was in the novels, BioSyn. they also want conflict between the Costa Rican and American government that involves the islands.
there are more but these are the must haves that most people want.