Jurassic World will be coming out in June 12th, 2015. Of course, Jurassic Park III came out in 2001, so when this is out, it'll be 14 years since the last.
Not a lot of it is known about the movie, but it's being directed by Colin Trevorrow, and it is set 22 years after the last movie.
I'm actually looking forward to this movie, but sadly it seems that with the actor list, not many - if any - actors from the previous three will be returning. After the first one, the second one was decent, and the third one felt more of a sci-fi movie spin-off then a part of the first two. Hopefully this one will not continue the spiral down, though I definitely can tell you know that it's going to be different than the others. I'm really hoping in a good way though.