I knew he won't be back given that he seems to be busy with other projects. It took them almost 10 years for Sin City 2 to happen and he still wants to do Machete 3, the last time I checked. Fox seems to move this movie forward fast, I guess we will get a director (hoping Shane Black will) soon and they might casting soon as well. It would be cool to have both Prometheus and Predator 4 in 2016.