MLB 13 The Show available on PSN today, even in Europe
You could buy MLB 13 The Show in a store if you wanted to, but Sony are making it available for download from the PlayStation Network on both PS3 and Vita. This is the first time The Show for PS3 has been made available in Europe, so that's pretty exciting.
MLB 13 The Show has plenty of cross-platform functionality -- you can play against players on either platform from either platform, for example -- but there's no cross-buy here. If you want bother versions you'll have to pay for both of them. Choose wisely.