Famitsu has the goods on Dissidia 012 Duodecim: Final Fantasy, and thanks to some lovely translation from Andriasang, you can find out all about the new modes Party Battle, MogWeb, and Original Quests for the PSP title.
Original Quest mode will allow users to create customized quests, name them, and add multiple battles as well as events that occur between said battles.
MogWeb can be used to download and upload quests. The later can be searched for by popularity or arrival order, and it will allow players to exchange quests with friends after exchanging the 12 digit friend code on the bottom of the interface screen. When player publishes their friend code online, other players will be able to search for the user's quests and download them.
Party Battle is a free battle mode consisting of five member party which will go up against anpther five member party.
Through the link, there's also detailed looks at characters Aerith, Warrior of Light, Garland, Frioniel, The Emperor and Cain Highwind.
Dissidia releases on March 3 in Japan and March 22 in US on PSP.