According to the Flex Schedule for Sunday games:
NBC Sunday Night Football is the beneficiary of the league's new flexible-scheduling system. For the final seven weeks of the season (seven of the final eight weeks during the 2006 and 2011 seasons because of Christmas weekend), the NFL has the flexibility in selecting games to air on Sunday night.
Which games do you think, we would get for FLEX Scheduling? My prediction is: Bears and Broncos or Broncos and Patriots if they are still in the playoff race. It's all about ratings.