So here in Europe it seems the game was unofficially-officially released on the 26th. I managed to get it that morning and beat it the next day.
I'm one of those people this game was made for. Got the first game for my 13th birthday in 2002, and played every damn one of them since with the exception of BBS 0.2.
For me the game absolutely delivered. It felt like a big enough step beyond Dream Drop Distance to be worthy of being called "Kingdom Hearts III." I like the changes they made to the level design, combat, and the overall feel of the controls. That said, I do kinda miss the command-deck system and wouldn't have mind trading in "Flowmotion" to get those back.
Disney worlds were handled well but there were a couple of low points. I thought Arendelle had too little interaction with the movie's characters, and the 100 Acre Wood was so short you wonder why it was even there. The high points for me were Corona and Toy Box. It was neat journeying alongside Rapunzel and Flynn to reach the town and even getting to explore it. Toy Box had the best world opening.
In terms of story it's exactly what you'd expect. If you've been following the series, you're already gonna have a pretty good idea what's about to happen, but it was still a fun and emotional experience seeing it all go down.
Anyway, I haven't played it since I beat it, but I still intend to go back to mess around with the Game & Watch clones and explore some more using the Gummi Ship, as I had to rush it to have it beat over the weekend.