Dal PS Blog americano:

-When you buy MotorStorm RC you will be able to play it on PS3 and PS Vita at no additional cost.
-When you buy Hustle Kings and/or Top Darts for PS Vita, you will get the PS3 versions for free. If you already own these games on PS3, y-ou’ll be able to download the PS Vita version for free
-If you purchase WipEout 2048 and you already own WipEout HD and the HD Fury DLC on PS3, you will be able to download them for free when they launch on PS Vita later this spring.
-DLC purchased for the PS3 version of Ultimate Marvel vs. Capcom 3 can be used on the PS Vita version for free (and vice versa).

Immagino che sta cosa verrà decisa per ogni gioco...potrei tollerare un piccolo extra da pagare (10 euro MASSIMO) per, ad esempio, comprare MGS HD Collection su Vita e poi averlo anche su ps3.