Some of the announcements include new worlds including what seems to be Castle of Dreams and the announcement that one of the worlds will be from a Disney world that has not been previously included in any Kingdom Hearts game thus far. Another announcement also includes the introduction of new multiplayer modes.
Last but not least, it was also confirmed that it was Ventus in the art that was released for Kingdom Hearts χ[chi]'s 3rd anniversary. Spoilers for Kingdom Hearts χ[chi]'s Final and Special episodes follow:
The official international Twitter account for Kingdom Hearts Unchained χ also made a tweetpromising that exciting announcements were coming soon as well!
A message from Tetsuya Nomura was also included with these announcements and can be viewed below thanks to Katie Armstrong.
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