There are now 5 different Saw III trailers all over the place, the first official clip online has just been released.
Click here to see the clip. Be forewarned though, this clip is not really safe for work (NSFW) due to violent imagery.
Saw III is the final part of a trilogy from writer Leigh Whannell and stars Tobin Bell, Shawnee Smith, Angus Macfadyen, and Bahar Soomekh. It opens in theatres October 27.