Jurassic Park IV has been going through quite the roller coaster ride ever since speculation began after Jurassic Park III was released in 2001, with various ideas and scripts being tossed aside. Rumor has it the 4th film will be shot in 3D. The 20th Anniversary re-release looked pretty good, so one actually shot with 3D cameras might actually be worth it, unlike many other films that are converted afterwards.
Colin Trevorrow will be directing the film, and he previously directed the outstanding indie film Safety Not Guaranteed which starred Aubrey Plaza, Mark Duplass, Jake Johnson & Kristen Bell. Steven Spielberg will be back to produce the film. Although I guess considering all the false starts and rumors of the past, we can take it all with a grain of salt. Hopefully this new script doesn't go extinct like previous ones, and please have some of the original cast back. Laura Dern & Sam Neill would be tops.