According to Bloody disgusting , Peter Spierig in an interview said that they set up the next movie of Saw and talked about a lot of things and ideas that could come up with the next installment and talking about questions that weren't answered in Jigsaw that need to be clarified for the audience even though they wouldn't be involved in the next one as directors .
Source : http://bloody-disgusting.com/movie/3481 ... aw-sequel/