As promised, Square Enix revealed the extended Big Hero 6 trailer for KH3 just days prior to the start of the Tokyo Game Show.
In short the trailer itself is 3 minutes and 43 seconds long, approximately 2 minutes worth of extended footage primarily composed of more gameplay, cutscenes which include mild spoilers so be prepared.
KH3 - Big Hero 6 Extended Trailer
Coinciding with the new trailer, Tetsuya Nomura revealed the box cover art for the PS4 and XBOX One release.