Nippon Ichi Software is working on an enhanced version of The Witch and the Hundred Knight. If you want to see how the PS3 game looks on PS4 you can try The Witch and the Hundred Knight Revival right now.
If you have a Japan region PlayStation Network account you can download the demo right now.
The Witch and the Hundred Knight Revival comes out on September 25 in Japan. While the game has not been officially announced for the West, it has already been rated in Germany indicating a Western announcement is forthcoming.