Pitchers will have 15 seconds, instead of 12, to make a pitch when there are no runners on base. The clock starts when the pitcher receives the ball from the catcher or whomever had it last. If the batter is not ready because he dawdled, each pitch would automatically be called a strike.
In addition to the mandatory removal of a pitcher if the manager or coach visits the mound twice in an inning, the rule is being expanded to include the mandatory removal at the time of the fourth visit overall in a game. No more than one infielder may visit the mound during any visit by a coach.
Baseline coaches (who are already required to helmets this year at all levels) will be prohibited from moving closer to the field than the front edge of the coaching box or the side closest to fair territory until a batted ball passes by them.