The release of Saw 
VI is just around the corner, but it's never too early to talk about the future. Producer Mark Burg and co-screenwriter Marcus Dunstan spoke with Collider and revealed what fans can look forward to in Saw VII and VIII. Burg claims that VIII may be the end for the series.
We're definitely making Saw VII. We're starting in January, and it's going to be in 3-D. The storyline that we started in Saw V and carry through Saw VI, ends at Saw VIII. Where it goes beyond that, I couldn't tell you. In my mind and in [producer] Oren [Koule]'s mind, we have the story threaded through Saw VIII. After that, I can't tell you that the franchise will continue.
Dunstan explained that knowing what that end will be is a positive thing for himself and co-screenwriter Patrick Melton.
That helps when writing, though. Even if it's a small detail, you know that this element has to happen in Saw VII and this has to happen in Saw VIII, so that we know we're getting up to that point. But, that isn't to say that there isn't definitely a clear resolution at the end of each story because there is, especially with Saw VI. Once you see Saw VI, you'll understand how it's supposed to end, and then, oops, something else happens and that will lead somewhere.
Burg calls that "something" a "twist."
Saw VI has a great twist. You're going to look at the film and be like, "F**k, they got me again! How did I not see this coming?"
Saw VII will be the first Saw in 3-D, and Burg says they are building the sets in a way that will take advantage of the 3-D technology.
We're going to design traps to come at you. The pendulum trap that opened the last Saw movie would have been great in 3-D.
We're planning a lot of the movie to be through the victim's eyes, seeing stuff as it's coming towards them, in their point-of-view. But, I think the audience wants a couple My Bloody Valentine-type moments, where the gun comes into the audience.
For now, Saw fans will have to enjoy the 2-D world of Saw VI when it opens October 23. Dunstan says the movie will give "a real clear understanding of what John Kramer's [Tobin Bell] overall plan was and, in turn, what Hoffman's [Costas Mandylor] plan was" by the end.