He only did the fourth Saw so Lionsgate would finance his Repo movie.
He's currently working on two different (non-Saw related) projects, editing the final cut of his Fear Itself episode and Repo, in addition to prepping his remake of Scanners.
While I'm reluctant to call him so much as a genius, he is definitely a talented director, and we have way too few of those who are American in this genre.