So far, the greater details of Kingdom Hearts 4 have been incredibly secretive. Despite the mystery surrounding the title, it is highly likely that recent Disney properties could be featured in Kingdom Hearts 4. Since Kingdom Hearts 3 was released back in 2019, there has been a plethora of films and television series released by Disney. Although some franchises are more likely than others, there is a long list of options for Kingdom Hearts 4 to choose from with new worlds.