As per the above review

Rating: Null/10 (28 October 2006)

I was at the Celebrity release party on Thursday and direct from the directors mouth, "Saw IV to be released Halloween 2007"
So the stones will continue to be unturned. Saw III does create some closure at the end, but of course not all questions are completely answered. By not tying things up in a nice tidy way they leave the audience as unsettled as some of the gruesome devices used in the film. You walk out a bit freaked out, and at the same time something in the back of your head is going "I want more".
I especially like how III, through flashbacks, gave so much more depth to the characters and situations from the first two movies. Unlike most films where they use archived footage with a soft edge filter, there are scenes from the first two movies that are completely redone from he vantage point of another character. Brilliant!