Vin Diesel posted another image on his Facebook, which I'm taking to be associated with Chronicles of Riddick 3.
However, it looks more like video game art to me, to be honest. Or maybe concept art.
Vin Diesel does own Tigon Studios, which makes games based off of his characters so maybe this is something from a new Riddick 3 game.
He also posted the following:
No regard for Necro royalty...