While promoting The Adventures of Tintin at Comic-Con, Steven Spielberg gave an update on Jurassic Park 4. Talk of this movie has been going on for years now, but Speilberg had some more concrete information for those attending the Comic-Con panel.
According to Steven Spielberg, there is already a story in place for the next film and it should arrive in theaters within the 2-3 years. Unfortunately, that's about as specific as he was going to get today. Previous reports have said that Universal is looking to leverage some of their proven older franchises and Jurassic Park is on the top of the list.