"The Hobbit: An Unexpected Journey is set to continue a month-long reign at the box office, outpacing newcomer Texas Chainsaw, which will open in 2,654 theaters."
The Hobbit should take in about $20 million. That's easy enough to predict. The difficulty is to come up with a number for Chainsaw. I guess it will be somewhere in the teens. It is currently running 36% at Rotten Tomatoes.