I think that Minnesota may have replaced Oakland, obviously due to the fighting, and at least temporarily because of Singletary? Not sure on the last part. 2011 was the only time that really made any sense.
It looks like the NFC West is playing the AFC West, with the exception of Minnesota for us and Green Bay for others. Dallas Cowboys come in instead of OAK/KC for Arizona. St. Louis only plays one AFC team, but apparently for no reason.