First BB has this in their ads, now Gamestop has it on their site. Looks like this is the promo that they were talking about if you were going to pick up both versions.
http://www.gamestop.com/games/mlb-12-the-show-for-playstation-3-and-ps-vita/99627
http://www.gamestop.com/games/mlb-12-the-show-for-playstation-3-and-ps-vita/99627