"The ball physics have been rewritten so that its reactions to dirt, grass and brick are all new. The the ball can fade in different directions and it isn't always the difference of a single pixel for a strike or a ball. Runners caught between bases can hold the two triggers rather than tap a single direction so that they can make the call when to run at the right moment. And overall errors don't happen randomly. They claimed you won't see the same fielding mistakes present in MLB 2K9. Errors are situation-dependent in that yes, a shortstop might just fumble a hard grounder, but a pop-fly won't be missed under the right conditions.
Phillies pitcher Roy Halladay provided advice and suggestions for a lot of the development process. He correct the dev team when they had something wrong and explained how certain situations in the game work out from his point of view. This expert testimony from the big leagues definitely pays off in the game as it all further exemplifies the attention to detail found in this experience."