According to the user's comment area netizens speculated, the structure of the red circle is likely to be at-ST's robotic foot.
Note the plantar part of the AT-ST
In addition, fans also found that the forest scene in the trailer was very similar to the Star Wars series of Endor Star.
A forest scene in the Kingdom Hearts 4 trailer
The star of Endor in Star Wars: Battlefront
Kingdom Hearts 4 is still in the early stages of development, and it will be some time before the game goes on sale. As for whether the Star Wars IP content will really appear in the world of Kingdom Hearts 4, and even whether players can meet famous characters such as Darth Vader, it needs further confirmation from the authorities.