The PS Vita version of Minecraft will be based on the console version rather than the popular pocket version.
Minecraft on Vita will be developed by 4J, the same team which is responsible for the Xbox 360 version of the game. There is a possibility that it will work in some way with the PS4 version, although this has yet to be confirmed.
Apparently the PS3 version of Minecraft will be released soon, although the PS4 version is still a while away. There is no indication as to when the PS Vita version will be released.