A trailer for the first Kingdom Hearts 3 DLC was shown during Square Enix's E3 presentation.
Actually, the trailer hit yesterday, but we missed it - so here it is again!
ReMind is due for release in winter. No price has been set yet, and it's not clear if additional DLC episodes are coming beyond this. Still, some folks weren't entirely stoked with how the original game ended, so there's the possibility of this DLC episode giving them some satisfaction.
So there you go - there's a brief glimpse here of what the DLC might offer, and what questions it may attempt to answer. Mileage and understanding may vary depending on how familiar you are with the Kingdom Hearts series, though.
Kingdom Hearts 3 is available on PS4 and Xbox One.