Square Enix has released the trailer for Kingdom Hearts III Re: Mind DLC which will feature a new story, boss fights, and more content. It has been compared to the final mix version of the Kingdom Hearts series.
The trailer shows various new boss fights and confirms that there are multiple playable characters now. This includes Roxas, Aqua, and Riku. They can be seen fighting around in the trailer.
Sora is also featured in the trailer and he has a new Keyblade form. There were no new areas shown in the trailer even though it will feature a secret scenario and new Re: Mind story chapter.
Kingdom Hearts III Re: Mind DLC will be out later in Winter 2019 for PS4 and Xbox One.