Speaking to MTV News, Vin Diesel revealed that there are two more Riddick movies in the works, because Pitch Black is essentially the same thing as The Hobbit:
“David Twowy right now is writing the scripts. The only question is whether we take a page from the ‘Lord of the Rings’ guys and try to shoot the two chapters at the same time. There are two more in mind,” he said of Riddick, the Furyan warrior first introduced in the 2000 film “Pitch Black.” “‘The Chronicles of Riddick’ was presented as a three part trilogy that would answer ‘Pitch Black’ in the same way that ‘Lord of the Rings’ answered ‘The Hobbit.’”
“Everyone knows I love the Riddick character and I’m always working on it,” Diesel asserted. “It just takes five years to make another one because David Twohy and I are so precious about it.”
Following the Riddick sequels and his return to the Fast/Furious franchise, Diesel will be moving on to other projects, like: (xXx)³, Boiler Room 2: Boiler Entire House, Remember Knockaround Guys?, Muscular Nanny 2,, and That One Where He's in Court ...AGAIN!, all of which should be really good, because Vin Diesel loves these characters--particularly Muscular Nanny.