Below is the official synopsis straight from ShockTillYouDrop.com for the third Vin Diesel film in his dark space franchise involving everybody's favorite anti-hero - Riddick.
"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."
The writer/director will be David Twohy. Twohy's film resume includes writing and directing both Chronicles of Riddick and the superior Pitch Black, as well as 2009's A Perfect Getaway, which I think is a hidden gem with a cool take on suspense films.