All the expectations that Final Fantasy Type 0 is a new game can be thrown aside now, it is Final Fantasy Agito XIII renamed. This means a few things, the game isn’t related to the XIII series and various sources on the net have hinted possible spin-offs as the domains for type-1 to 3 has been registered.
A new trailer was shown and ended that the game will be available for the PSP in Summer 2011. Official website is here although it is pretty empty now.
Final Fantasy Type 0 is a single player RPG with multiplayer features. The game will come in 2 UMDs and over 30 voiced characters – some of the seiyuu are rather popular but no names were mentioned. (Source)