According to Polygon, Tetsuya Nomura, creator of the Kingdom Hearts franchise, is very much interested in adding Star Wars and Marvel to the Kingdom Hearts series. He states:
Of course it would be great if we could add those licenses as well.
But there are lots of rules and restrictions by Disney so we can’t actually put in everything people want.
So it’s a quite difficult decision but we’re gonna prepare some surprises for you so, just wait for the information.
While this may mean very little towards becoming an actual reality, all it takes is a little spark to cause an uproar. With Nomura saying he is interested in having those characters and worlds in the game, let the fan art commence, the rant videos begin and keep the fans dreaming. In fact, start here. What Star Wars and Marvel character would you like to see in the next Kingdom Hearts?