4J Studios announced that Minecraft: Vita Edition will be releasing in Europe on October 15 of this year.
— 4J Studios (@4JStudios) October 8, 2014
There is no word yet as to when there will be an American release.
Minecraft: Vita Edition will be available as a Cross-Buy game for anyone who already has Minecraft on PS3, but the PS4 version will exist separately. Owners of the PS3/Vita version can purchase the PS4 version at a reduced cost.