It's part of new gameplay features on defense. It's huge. You can key your defense on runs to the rt, lft, or middle. You can also key a pass. If you choose to use this feature and guess wrong you're gonna pay a price. If you guess correctly... for example when you know there will be a qb sneak. well.... let's just say you're opponent is not going to be happy with the result. usually a 2 or 3 yd loss with superhuman turbo mayhem crushing the OL