Square Enix has countlessly revealed their desire to add Marvel Heroes in Kingdom Hearts 3 hence we can gladly assume the world to feature in the upcoming sequel.
Also, knowing that Marvel Heroes will disrupt the power balance in the world of Kingdom Hearts, we can expect the world to play a small role in Kingdom Hearts 3.
Perhaps, Square Enix will develop a sub-plot which involves Marvel Heroes. Once the sub-plot is completed, players will see a cutscene where the Marvel characters lend their equipment to Sora’s companions.
The thought of seeing Mickey and Goofy wielding Iron Man’s battle suit and Captain America’s shield respectively is truly exciting. Then again, this is just based on our assumption on things. We will definitely know more about this when Square Enix unveils Kingdom Hearts 3 at E3 next month.