They included:
Allowing down-by-contact calls to be reviewed by replay to determine if the ball came out before the ball carrier was down, and who recovered it. In the past, those plays were not reviewable when officials ruled the whistle had ended the play.
Prohibiting pass rushers from hitting a passer in the knee or below unless they are blocked into him. The officiating department showed low hits that caused serious injuries to Cincinnati's Palmer, Pittsburgh's Ben Roethlisberger and Tampa Bay's Brian Griese, although in all cases, those would not draw penalties because the rushers were blocked in such a way that they could not avoid the hits.
Toughening the horse-collar rule enacted last season. It now bans tacklers from taking down ball carriers from the rear by tugging inside their jerseys. Last year's rule required that the tackler's hand got inside the runner's shoulder pads. Only two horse-collars were called in 2005 and the officiating department said one was an incorrect call.
Prohibiting defensive players from lining up directly over center on field-goal and extra-point attempts to avoid injuries to long snappers.
http://www.nfl.com/news/story/9345607
Also mentioned was regarding celebrating in the endzone which I believe has already been discussed here.
On NFLNetwork I also saw that a team cannot overload one side of the field on onside kicks anymore. I've yet to find a link. Interview with Fisher and he said it could force teams to be more creative like faking kicking one way and kicking the other and such.
Allowing down-by-contact calls to be reviewed by replay to determine if the ball came out before the ball carrier was down, and who recovered it. In the past, those plays were not reviewable when officials ruled the whistle had ended the play.
Prohibiting pass rushers from hitting a passer in the knee or below unless they are blocked into him. The officiating department showed low hits that caused serious injuries to Cincinnati's Palmer, Pittsburgh's Ben Roethlisberger and Tampa Bay's Brian Griese, although in all cases, those would not draw penalties because the rushers were blocked in such a way that they could not avoid the hits.
Toughening the horse-collar rule enacted last season. It now bans tacklers from taking down ball carriers from the rear by tugging inside their jerseys. Last year's rule required that the tackler's hand got inside the runner's shoulder pads. Only two horse-collars were called in 2005 and the officiating department said one was an incorrect call.
Prohibiting defensive players from lining up directly over center on field-goal and extra-point attempts to avoid injuries to long snappers.
http://www.nfl.com/news/story/9345607
Also mentioned was regarding celebrating in the endzone which I believe has already been discussed here.
On NFLNetwork I also saw that a team cannot overload one side of the field on onside kicks anymore. I've yet to find a link. Interview with Fisher and he said it could force teams to be more creative like faking kicking one way and kicking the other and such.