During Japan D23 a brand new trailer was revealed officially showcasing a Monster's Inc. world, the trailer also includes footage from Toy Story and Tangled including past Kingdom Hearts characters such as Marluxia and Vanitas (plus Ariel summon!)
In the second trailer it premieres Utada Hikaru's new song for Kingdom Hearts 3 "Oath" (note: the title could be something else since google translate can be wonky with Japanese translation) the trailer also shows off Riku and Mickey's new look for the first time.
#KingdomHearts 3's release date will be revealed at E3! https://t.co/vGOSaLDuHa
— Kingdom Hearts Insider (@khinsider) February 10, 2018
Also according to the people that were at the event the official release date will be announced during E3 so keep a lookout for that!
SOURCE 1& 2
Unfortunately no english version of the trailer from the time I submitted this post. Even though I find the monster inc designs... "questionable" I'm still super hyped, this game looks amazing.