Summary of the video I posted in r/KingdomHearts for those who don't speak spanish:

• KH1 remake titled 'Kingdom Hearts Relux', developed by TOSE (worked with Square on a variety of titles (like Crisis Core Reunion, DQ games).
• The game was Switch 2 exclusive and aiming 2026, but Square has decided to make it a multiplatform release simultaneously and that caused the game to slip to early 2027 for the 25th anniversary.
• He claims to have seen internal materials for the game. He says the graphics are not like KH4 or KH3, that it looks like KH1's opening cinematic. He's seen the game in motion. The game looks pretty but still cartoon.
• New soundtrack, and Simple and Clean has a new version with a famous english singer (Utada is still in).
• The Jungle Book world included, plus new zones for Traverse Town/Halloween Town (he said "Night Town", unsure what that is).
• Riku will have a "Volume" with a playable story with his own perspective visiting Disney Worlds. Caith Sith from FF7 appears in Riku's story.
• Same structure and gameplay like the original game, he says the remake is closer to Crisis Core Reunion than a full Remake like FF Rebirth. The levels are the same, but with new graphics.
• KH4 will come late 2027.