Full list of rule changes

[MightyGiants]

[zephirus]

I got really excited for a moment when I saw that the game clock can be challenged upon whether it expired or not but realize this doesn't extend to play clock.  Why limit the application only to the expiration of the game clock, which happens only 4 times a game?  Drives me batty that so many teams get that built in extra half second from when the play clock expires to the snap because the refs are human and can't see the clock and the snap at the same time. 

[Jolly Blue Giant]

Rule change 5 could be impactful. It will be weird when flags are thrown on both the offense and defense, but only the offense gets penalized...third down only...I think 

Super glad they are going to monitor the clock and check replays

The new kick-off rules will (I think anyway) cause the biggest change in the game. I think teams will be starting much closer to midfield if they return a kick. Going to make it important that teams have a kicked with a huge leg that puts it out of the end zone