As promised, Square Enix has released a new Kingdom Hearts trailer that showcases footage and gameplay from both Kingdom Hearts HD 2.8 Final Chapter Prologue as well as Kingdom Hearts 3.
For those unfamiliar, Kingdom Hearts HD 2.8 Final Chapter Prologue is a new compilation featuring full-HD remaster of Kingdom Hearts 3D: Dream Drop Distance, a completely new HD theater cinematic called Kingdom Hearts χ Back Cover, and a short brand new Kingdom Hearts playable episode called Kingdom Hearts 0.2 Birth By Sleep -A Fragmentary Passage-.
Kingdom Hearts 0.2 Birth by Sleep – A Fragmentary Passage is a completely new episode played from the perspective of Aqua. Set after the storyline of Birth by Sleep, the episode links to the story of Kingdom Hearts 3 (which also explains why the KH3 trailer is at the beginning). Meanwhile, Kingdom Hearts χ [chi] Back Cover is an HD movie that tells the mysterious story of the Foretellers, connecting the earliest parts of the series' history.
Of course, the real reason you're here is for Kingdom Hearts 3 footage. Well, today's trailer features that as well. Skip to 3:38 of the trailer for Kingdom Hearts 3.