A trailer has yet to be released, but an International Poster has popped up (see it in full below). Diesel had hinted that the film could be released as soon as January 2013. It was previously reported it would be released in the first quarter of 2013.
This time around:
"Betrayed by his own kind and left for dead on a desolate planet, Riddick 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."
If a first quarter release is indeed true we can expect a trailer to drop really soon.