As reported earlier, a Kingdom Hearts III Premium Showcase event was taking place this week, allowing notable figures in the online KH community to try out the highly anticipated game for the first time. While some leaks have gotten out, now that the embargo has been lifted, we can finally post what's been revealed:

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Probably the biggest news to come out of the event, it has been revealed Wreck-It Ralph himself will be a summon in KH3!

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Also revealed was what looks like a new blue-haired villain (wearing bunny ears?) confronting Sora and his friends in the Toy Story world. Check out additional images below (which also confirm the appearance of the famous Pixar easter egg in KH3, the Pizza Planet truck!).

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This thread will be updated with any additional info revealed as they come.

Thanks to @Gelatinous Ghost for the info.

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Source: Gematsu

EDIT: Some additional tidbits from KHInsider! 1, 2

• You can switch between Keyblades on the fly in the middle of combat!
• The Toy Story world is called Toy Box.
• As his summon attack, Ralph creates blocks across the battlefield (as directed by Sora) and then blows them up.
• As her summon attack, Ariel creates puddles that erupt into fountains of water.
• You can see Dissidia Final Fantasy NT toys on the shelves of Galaxy Toys in Toy Box.
• Rex the Dinosaur offhandedly mentions being stuck on the Bahamut boss in his latest video game.
• Woody has some trouble wrapping his head around some of the events of the game.
• Parts of Olympus Coliseum were inspired by co-director Tai Yasue's visit to Yosemite National Park.
• Originally, Ralph wasn't going to be revealed until next month, but Square Enix decided to add him to the Premiere demo.
• Predictably, Rapunzel's hair gave the dev team a challenge (it took Disney animators years to figure out). She holds some of it in her arms while the rest trails behind her and interacts with the environment.
• From KH13's Twitter: The Keyblade from Kingdom of Corona is called Ever After.

Square Enix has also released a slew of screenshots. Check them out!