Uhm... isn't Ni No Kuni a Bandai Namco IP? Wouldn't Sony use White Knight Chronicles or one of the other IPs they own for a Level-5 sequel game?
Ni no Kuni is a Level-5-owned IP: https://oami.europa.eu/eSearch/#details/trademarks/010284024
Bandai Namco just published it in the U.S. and Europe.
Anyway, Ni no Kuni 2 is probably a thing, and I don't see why Bandai Namco wouldn't partner with them again on the western publishing given the success of the first game. Sony wouldn't publish it because Level-5 owns it. I'm hoping they have a first-party thing going on with Sony, too.