A lot has changed since preseason prospect lists were released. A number of top prospects such as Mike Trout and Bryce Harper have been called up to the majors. Other talented prospects have struggled.
Most recently, MLB teams have selected a number of new players in the 2012 MLB draft. These players will have a major impact on farm system rankings moving forward.
For the sake of this article, it will be assumed that all players will sign with the teams that drafted them. This obviously will not be the case, but this at least provides a possible glimpse into what the farm system rankings may look like next year.