No more missed trigger nonsense at bigger tournaments. Rules changed so you only have to demonstrate awareness that the trigger happened; ie if you attack with {Pyreheart Wolf} and don't say anything, if you're opp tries to flash in {Restoration Angel}, as long as you say "you can't do that," you're good. Only way to miss the trigger is to genuinely forget, like if you put you wolf in the graveyard.
See here for the full article.
http://www.wizards.com/magic/magazine/article.aspx?x=mtg/daily/feature/233
Good read, thanks dude
Most certainly a better system.