According to the article, starting next year managers will have a challenge system for video replay similar to what the NFL does. Note particularly that, on disputed plays, the final call will be made be an official in the league offices and not the crew on the field, similar to what the NHL does right now. The only thing off-limits is balls & strikes. MLB expands instant replay in 2014 to include manager video challenges - ESPN http://www.usatoday.com/story/sports/mlb/2013/08/15/mlb-instant-replay-manager-challenges-on-hold/2659555/ Personally, I think eventually balls & strikes too will be subject to more electronic scrutiny. Welcome to the 21st century, MLB.