The March issue of Game Informer has made its way out and it includes an article on MLB 2K8 that mentions a few previously unknown details about the game.
Apparently the 360 version of the game is lacking the unlockable stadiums and Cool Base alternate uniforms that the PS3 version has. Because of that they will be made available on release day as free downloadable content. While this shouldn't bother those who have access to Xbox Live, those who don't will miss out on the content completely which is unfortunate.