That is all they are about--safety. Too many helmets coming off because these knuckleheads don't buckle up completely. So if the helmet comes off during play & it is not coming off because somebody from another team pulled it off in a typical illegal act, you go out & sit a play, just like being injured. With all the emphasis on concussions, you are going to see more of the safety stuff.
Going to see far more downed balls in the end zones also so I guess they don't want the big collisions on the kicks. Kickoffs back up to the 35 would seem to mean more kicks into the endzone and the ball comes out to the 25. But I think a punt into the end zone still comes out to the 20? Don't know why that difference?