Well NFL with trying to make the on-side kick different has passed a 1 year rule in which the receiving team will only be allowed 9 players withing 25 yeards of the ball thinking that taking away 2 players will give the kicking team a better chance to get it. Really will this matter?NFL had changed it that you could not have a bunch of guys on one side of the field anyways and you take out the kicker the kicking team will only have 10 guys going after the ball compared to the 9 on the receiving team. I don't think this changes the chances much at all of a recovery for the kicking team.
Also the reply booth can now talk to the refs more on a reply that is not a coaches challenge though they say reply refs have been doing this for years anyways with informal advice.
Seems they passed a bunch of useless rules just for the sake of passing a rule.