This was my question: "If I buy the Vita version of Playstation All Stars Battle Royale, will I get a digital PS3 copy as well? or does it only work if you buy a PS3 version?"
The following was an email response from Sony, print-screened:
"Thank you for contacting PlayStation®Technical Support. My name is Mike, and I will be more than happy to assist you today with your question about Cross-Buy. It does not matter which version you buy. If you buy the PlayStation®3 version of PlayStation® All-Stars Battle Royale you will be able to download the PS Vita™ version from the PlayStation®Store for free. And its the same with the PS Vita version, you will get a digital version of the PlayStation®3 version of the game."