Twenty years after Steven Spielberg brought dinosaurs back to life on the big screen, "Jurassic Park" is roaring back into theaters this weekend as a 3-D re-release. The film, which banked close to $1 billion, has spawned two sequels - with a third currently in development for a summer 2014 release. 

Naturally, everyone is curious as to what this fourth film might include. It's been over twelve years since "Jurassic Park III" arrived and since then efforts to continue the story have gone through several delays - mostly because Spielberg never saw a script he liked. "He felt neither of [the drafts] balanced the science and adventure elements effectively," the late special effects artist Stan Winston said in April 2005. "It's a tough compromise to reach, as too much science will make the movie too talky, but too much adventure will make it seem hollow."

What we do know is that "Rise of the Planet of the Apes" scribes Rick Jaffa & Amanda Silver are writing the script with Colin Trevorrow (“Safety Not Guaranteed”) set to direct. Spielberg will serve as executive producer. According to paleontologist Jack Horner, who is acting as a consultant on the film, we'll also get a new terrifying dino villain. 

"I can't actually tell you who that will be," Horner told USA Today. "But you'll want to keep the lights on after you see this movie."

One thing I'm pretty sure of won't be a part of the fourth film is the bizarre dinosaur/human hybrids previously considered

"Back in 2005, William Monahan and John Sayles wrote a script for Jurassic Park 4 in which a secret genetics lab has been cross-breeding humans with dinosaurs," wrote a source on Reddit last year. "The result is an army of grotesque and intelligent humanoid dino freaks with problem-solving intelligence and the ability to fire automatic weapons. Yeah. Their storyline was scrapped but it apparently got much farther along in production than anyone realized."

You can see some concept images of those creatures here - described by AICN as having "dog DNA for increased obedience and human DNA so they can solve problems well." A trailer for the 3D re-release in theaters this weekend is below. 

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