As for returning cast members, Costas Mandylor (Mark Hoffman) has signed for Saw 6, as has Tobin Bell (Jigsaw).

The fate of Dr Gordon from Saw 1 remains the biggest mystery in the series. The reason he never reappeared in subsequent movies is that actor Cary Elwes filed a lawsuit in 2005 against the producers for shortchanging him on pay. The rumor is they have now made up and Leigh Whannell says Elwes might be back for Saw 6.

(Dr Gordon’s fate may actually be revealed in the upcoming Saw Video Game, since it’s written by original creators Leigh Whannell and James Wan and set at the same time as Saw 1).

There have also been hints that the infamous bathroom set could make a return, after an absence from Saw 5.