Check out the Famitsu version of Terra & Kefka introduction for Dissidia Final Fantasy. Their EX Mode, and those of Garland and Warrior of Light were shown. Three summons were revealed, they are Leviathan, Barbariccia of Wind and Bomb. Also shown for the first time are the menu screens, of which the Main Menu lists Story Mode, Quick Battle, Communication Mode, PP Catalog, Museum, Player Data and Option. Data Install is also explained, players can choose to install either 245Mb, 373Mb or 528Mb of data to shorten the loading of the game.
Update: Revised with more info.