Vin Diesel just posted his first photo from the set of Riddick. Filming is currently underway, with David Twohy back in the director's chair. The official cast list has not yet been anounced, but Katee Sackoff, Nolan Funk, Jordi Molla, and Karl Urban have been revealed as having roles in the film.
"Betrayed by his own kind and left for dead on a desolate planet, Riddick (Diesel) fights for survival against alien predators and becomes more powerful and dangerous than ever before. Soon bounty hunters from throughout the galaxy descend on Riddick only to find themselves pawns in his greater scheme for revenge. With his enemies right where he wants them, Riddick unleashes a vicious attack of vengeance before returning to his home planet of Furya to save it from destruction."