Sony initially said that both Flower and fl0w would be available for the PlayStation 4 and Vita near the PS4's launch, but only Flower made it out the door. Sony announced today that fl0w is indeed coming to both consoles, and it will hit the PSN store on December 17th.
It's a cross-buy game, so if you already purchased the game for the PlayStation 3, it will automatically be available for you to download for free on both the PS4 and the Vita.
If you haven't checked out the artsy title from Thatgamecompany, it costs $5.99 and the DLC is $1.99.