Toriyama then talks about a "new style" where FFXIII will not have an actual main character. Instead, players will experience the story from the viewpoints of different characters. One of the main focuses of the demo will be to allow players to try out this "new style." The battle system also allows you to switch characters; it will be party-based and the player will switch between each character during combat.
As a bonus, Forever Fantasy has scans of the screenshots from the FFXIII story. There are even a few Versus XIII pictures as well. Take a look here.