I got a theory that the Black Box maleficent was asking to Hades was probably KH version of Pandora Box, which instead of having sealed all the worlds evil it has something something darkness related sealed in it (or maybe she's talking about that black box the Master of Master's student was carrying at the end of Back Cover movie)
I can't get over how pretty this game looks. Maybe it's not the most technically impressive but the artstyle and colors are on point, and the lighting gives it this really nice "soft" look. Disney characters look particularly great, Sora's face is a bit weird but that'll probably get fixed like with 0.2.
Regarding the black box, I wouldn't be surprised if even Nomura doesn't know what's inside yet.