Looks like Atlus detected some potential in the PSP, probably due to the upcoming release of the PSPGo. Right after the announcement of Persona 3 Portable they just unveiled a new JRPG scheduled to be released (in Japan) on November the 12th on Sony's portable console.
The new game, named Hexyz Force and developed by Sting Entertainment (the creators of Yggdra Union, Knights in the Nightmare, Dokapon and Baroque) will be set in a world split in two by an ancient war between the Goddes of Creation and the God of Destruction...