So far Square-Enix are making 2 FFXIII for the PS3, 1 FFXIII for 360, 1 FFXIII for PSP.

If this game was copyrighted during Dissidia, could this mean we would have a second PSP game?

Right now, I think Square-Enix is just waiting to see if XIII is going to be a major sucess or just a plain success.