The Kingdom Heart 3 was officially announced E3 last year and since then, Square Enix has revealed that the game will be pushed back because they will be switching the engine of the game. Since it takes time to switch engines, it has been predicted that we will only see the game next year.
With the game being so far away, interest in the game have been slowing down as gamers focus their attention on the other games first however, they were still some talks about what new characters we will be seeing in the game when it arrives later this year or next year.
Since Marvel and Star Wars has such a huge fanbase, it is believed that we might be seeing some characters from those franchise making it into the game. Fans were hoping that Darth Vader will be included as one of the villains in the game.
There were also some speculation about the characters from Frozen making it in but at this point, nobody really knows for sure. Maybe we will hear something at E3 this year?