Wyczytałem na Wiki taką ciekawostkę:

On August 4, 2009, David Twohy confirmed that Diesel's newly restored box office clout may help get another Riddick outing off the ground [4]. "I've sketched out two stories and Vin and I have figured out which one we liked best," he said.
http://www.ottawasun.com/entertainment/movies/2009/08/04/10352446-sun.html

On December 3, 2009, Vin Diesel updated on his Facebook page that location scouting has begun in New Zealand for the new movie.[5]
http://www.cinemablend.com/new/Vin-Diesel-Claims-A-New-Riddick-Is-Happening-In-N ew-Zealand-15972.html


On February 11, 2010 Vin Diesel and David Twohy confirmed production of the fourth film entitled "Riddick".[6]
http://www.variety.com/article/VR1118015101.html?categoryid=13&cs=1

:)