Is ps3 disc version of minecraft crossbuy? How?

I was contemplating on either buying a ps3 download or disc version.
I know that digital version of ps3 is crossbuy and i can get vita version for free and ps4 version for $5.
I have a ps4, vita and xb1. So i was thinking if i could get crossbuy by getting the ps3 disc version, i would get it right away.

The psvita game has not even released yet and there's no word of cross buy ( just rumors, nothing official ) but if it is you could probably get it free with the ps4 digital copy and not have to buy the ps3 disc if you don't even have a ps3 anyway. Its not like you could trade or sell the ps3 disc since you would need to insert the ps3 disc to use the upgraded digital copy to make sure you didn't just get a code from someone who doesn't have a ps4 and that you actually own the ps3 disc
its the same price buying the $15 ps3 game plus $5 as it is to buy it on ps3 for $19,99 and you're better off just buying it for ps4 if you want the game then if they do make it cross buy you'll get the vita version free