Saw IV's current incarnation won't be hitting the main street theaters any time soon, it got an NC-17 rating. There are rumors that Comic-con though about turning down their movie clip of the first five minutes of the movie because it was too graphic. Lionsgate will probably make the director and editors trim the brutal fat to make the movie more palatable to the ratings board. Mark Burg, the producer, said “One day we’d like to have the guts and leave it like it is...” It'll be interesting to see who carries Saw IV if they decide not to tone it down.
Thanks Slash Films for the info!