A few highlighted changes among others to fit games into snug little windows:
https://www.milb.com/milb/news/minor-league-baseball-announces-pace-of-play-regulations-for-2018/c-268683294
- Limited mound visits
- Pitch clocks for AA /AAA (violations add a ball to the count)
- Extra innings begin with a runner on second ( on base player is the player proceeding the batter in the lineup)
https://www.milb.com/milb/news/minor-league-baseball-announces-pace-of-play-regulations-for-2018/c-268683294