Since the film was announced, Vin Diesel has promised that Riddick would return to the series' roots and get an R-rating.  Today, the MPAA has confirmed that the anti-hero's new film will indeed be rated-R.  It’s not too difficult to land an R-rating, but fans should be pleased that they'll probably be getting something along the lines Pitch Black and Escape from Butcher Bay rather than The Chronicles of Riddick.

Hit the jump for the movie's synopsis.  The film also stars Karl Urban, Katee Sackhoff, Jordi Molla, Matt Nable, Conrad Pla, Raoul Trujillo, Nolan Funk, Keri Hilson, and Bokeem Woodbine.

Here's the official synopsis for Riddick:

The latest chapter of the groundbreaking saga that began with 2000′s hit sci-fi film Pitch Black and 2004′s The Chronicles of Riddick reunites writer/director David Twohy (A Perfect Getaway, The Fugitive) and star Vin Diesel (the Fast and Furious franchise, xXx). Diesel reprises his role as the antihero Riddick, a dangerous, escaped convict wanted by every bounty hunter in the known galaxy.

The infamous Riddick has been left for dead on a sun-scorched planet that appears to be lifeless. Soon, however, he finds himself fighting for survival against alien predators more lethal than any human he’s encountered. The only way off is for Riddick to activate an emergency beacon and alert mercenaries who rapidly descend to the planet in search of their bounty.

The first ship to arrive carries a new breed of merc, more lethal and violent, while the second is captained by a man whose pursuit of Riddick is more personal. With time running out and a storm on the horizon that no one could survive, his hunters won’t leave the planet without Riddick’s head as their trophy.