originally posted by Wikipedia
In an interview with Tetsuya Nomura in Weekly Jump magazine, the Kingdom Hearts creator had expressed interest in a possible international version of Kingdom Hearts II although there were no definite plans. He said that should a "Final Mix" version arise, he has a "trump card" in mind with such features as the Mushroom Heartless found in the first Kingdom Hearts. In September 2006, Square Enix announced that they would develop Kingdom Hearts II: Final Mix+. Current scans of magazines show that Final Mix+ will feature new scenes including one with Roxas in the World that Never Was, Axel speaking to Naminé and Riku, and an extended version of the secret movie featuring one of the knights with his faceplate broken.
More information at the TGS 2006  revealed that Kingdom Hearts II: Final Mix+ will be a 2-disc set. The first disc will contain the main game with English voice acting and added contents. The second disc will contain a 3D remake of Kingdom Hearts: Chain of Memories, with Kingdom Hearts II and Kingdom Hearts' graphics, extra scenes and voiceover for particular scenes. The battle system will be largely the same, though it will implement Reaction Commands. The game will be released in Japan in 2007. Unlike Kingdom Hearts: Final Mix, this set has been speculated to have a possibility of release in North America.