The bigger one first: “Final Fantasy x GREE” is the tentative title of the first Final Fantasy game to hit GREE.
Final Fantasy x GREE is a card battle-based RPG that will contain elements (monsters, weapons, characters, etc.) from a number of previous Final Fantasy games.
This game will be released on GREE for smartphones and feature phones by the end of the year (in Japan only).
The World Ends With You, on the other hand, will make its debut as a social game on GREE (as “The World Ends With You – Live Remix”).
The World Ends With You – Live Remix is scheduled to hit GREE by the end of the year, too (in Japan and on smartphones only).