Yeah, it's sole purpose was to establish Hoffman as the new Jigsaw - fill in his background etc. Which is fine, it helps; Part II had nothing of the sort! Ha. It was typical follow-up material.
I heard they've planned 9 - but only 8 have the greenlight I believe. I know the man who made Part V is taking the riegns again on Part VII (3D); which I feel is a msitake, the chap who made Part VI really has a feel for the material and injects a much needed pace into it - much like Part III had! Maybe he'll come back for VIII?