There are several new rules and points of emphasis in 2015:
Extra point: The extra point attempt will now be snapped from the 15-yard line. Two point-conversions will remain at the two-yard line. Additionally, the defense will be able to return a blocked kick, interception or fumble for two points.
Injury timeout: The independent ATC (certified athletic trainers) spotters located in the press box are allowed to notify game officials to stop the game if a player exhibits obvious signs of disorientation or is clearly unstable, and it becomes apparent that the player will remain in the game.