According to this article the Thanksgiving game in Detroit will either be Houston or Indy. http://www.detroitnews.com/apps/pbcs...=2011112300413
"Coming to Ford Field next season will be St. Louis, Seattle, Houston, Indianapolis and Atlanta.
The Thanksgiving Day game will be against either Houston or Indianapolis"
With the season we had and the Colts/Peyton's future up in the air I have to think we pretty much have a Thanksgiving game locked up next season.