So the first information of DisneySea Halloween has been released along with a picture!! It looks like the theme will be an exotic gorgeous Halloween and there will be special fireworks, a more international based Halloween, special menu's (of course!), atmosphere characters, and a 25 minute show called Mysterious Masquerade! Mysterious Masquerade is about characters who are invited to a dance party and turned into ghosts! There will be another event that sounds like a street performance (greeting?) called masquerade dance where you can dance with the characters. The fireworks will be called Night High Halloween and will use search lights with the fireworks. I'm so excited about this!!
This is the article but it's all in Japanese.