It seems despite countdown ending next week, the announcement for what it is revealing was said accidentally. The World Ends With You, a favorite among many people, will be getting a re-release on iOS along with a new CD arrangement.
The accidental reveal came from the Japanese Square Enix store. The description of the CD mentions that it is to include tracks from the iOS version of the game, which features a remixed soundtrack.
Something else may still happen when the countdown hits zero, but this is likely the big reveal from it.