Universal have signed a deal with star Vin Diesel and director David Twohy to release a third movie based on the character of Riddick, following on from the excellent Pitch Black and the promising-but-overblown Chronicles of Riddick. The third film, with the working title of just Riddick, will apparently retreat from the (expensive) complexities of the second movie see a return to the smaller-scale action of the first movie.
This could be promising. I didn't hate Chronicles of Riddick and found it somewhat enjoyable, if a much less successful film than the original. However, Pitch Black and the two spin-off computer games from the series, Escape from Butcher Bay and Assault on Dark Athena (all made with Twohy and Diesel's involvement), are all superb, so colour me cautiously optimistic that this could be an interesting flick.