"There was never a plan [at first]. As a core game, this is finally the third, and 10 years have passed. I couldn't call this a trilogy. There have been so many spinoffs. In ‘Kingdom Hearts 3,’ the battles that the characters have been fighting for the past 10 years will come to a conclusion. But the series will continue. Only the particular enemy they have been fighting the past 10 years will come to an end,"
While not every PS4 game will take advantage of the Vita in this way, Sony is still promising that virtually every PlayStation 4 game will be playable on the handheld itself via Remote Play.
Personally, I don't care about the PSVita being a controller, just a PS4 controller is good enough for me.
God Bless and Play Hard Gamers!