With the Us open going on now, not sure how many of you have heard that ESPN takes over the entire US Open in 2015 including the finals. They may subcontract some of the match coverage to CBS.
This change would likely effect how the NFL is broadcast.
This is my speculation.......
NFL will go to dual doubleheaders for week 1, week 17, and another week (either week 16 or a week in November sweeps). then the other 14 weeks would be single network DH.
Another option they add another bye week to make it 18 weeks...then only 2 dual DH weeks (first and last)