That means that players can expect a borderless experience from their PAL copy, and a Square Enix spokesperson tells us that the speed of the game has been updated to match the NTSC version. It will run at 50Hz, but the experience is the same, essentially.
"The full screen and full speed experience is something we are aiming to implement in all our upcoming releases," Eurogamer was told. "We included it with Dragon Quest: The Journey of the Cursed King and it will also be in Kingdom Hearts II."
After a bit more kicking, Square Enix said the same would be true of Dirge of Cerberus: Final Fantasy VII, which is due out in November, too.
Edit: Another source has just added the Kingdom Hearts II Final Mix article also.