Ignore all the misleading sources regarding crossplay. Here is what Sony says.
3 Great Reasons to Try PS Vita/PS3 Cross-Play Content – PlayStation Blog
Quote:
Here’s how it works:
If you purchase Hustle Kings for PS Vita, you will get Hustle Kings on PS3 for free. If you already own Hustle Kings on PS3, you’ll be able to download the PS Vita version for free.
If you purchase WipEout 2048, you will be able to download WipEout 2048’s DLC packs, WipEout HD and HD Fury for free when they launch on PS Vita later this spring (if you already own the PS3 versions)
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).
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No one really knows what to expect for any future games with regards to crossplay. Sony didn't say anything yet.