Just recently, Square Enix stated that they were still interested in developing games for the PSP. We now know one of those games: a sequel to last year's Dissidia: Final Fantasy.
The leak comes from the latest issue of Weekly Shonen Jump, which reveals the game's title, Dissidia Duodecim: Final Fantasy. Lighting from Final Fantasy XIII and Kain Highwind from Final Fantasy IV will be included in the sequel. The scan doesn't confirm anything else, but it's likely the game will have the characters from the first game playable again.
Dissidia Duodecim: Final Fantasy is set for a 2011 release in Japan. Square Enix has yet to announce a North American or European release.