Vin Diesel revealed a few details to SCI FI Wire about a proposed third film in the Chronicles of Riddick series, which he confirmed is in the works.
"We're going to find Riddick alone for the first part of the movie, barely alive, surrounded by carnivorous monsters who are trying to eat him," Diesel said in response to a question from SCI FI Wire. "So you'll see a futuristic Rambo-esque Riddick trying to survive."