In regards to an "official" plot synopsis for The Texas Chainsaw Massacre 3D, things have been rather quiet.
Well, I found a one-page story breakdown at the American Film Market, and I think it would be downright wrong to run this spoiler-filled play-by-play. It reads very much like a script treatment.
The set-up to the synopsis is safe, however, so I'll share that here.
Twenty years ago, the town of Newt, Texas exacted vengeance on the Sawyer family for their role in assisting and concealing murders committed by the chainsaw-wielding maniac Jeb Sawyer, aka "Leatherface." The entire family was presume killed when Burt Hartman led the townspeople to burn down their farm house, but the Sawyer infant survived and was secretly taken away by two of the vigilante townies, Gavin and Arlene, and raised their daughter Heather. It's not until she's in her twenties that Heather learns that she's adopted. A lawyer for her grandmother tracks her down with word she's been left an inheritance.
Angry at her parents for lying to her, she sets out for Texas on a road trip with her boyfriend Ryan, friends Nikki and Kenny, and Darryl, a hitchhiker they pick up on the way.
Ultimately, Leatherface shows up when this team arrive in Newt, Texas and he raises some hell. As I said, to share much more would be ruining a lot of the twists. But I figured you'd like to hear the lead-in...
Source: Ryan Turek, Managing Editor