Sanzaru Games had previously announced that they are working on the game Sly Cooper: Thieves in Time for Playstation 3

But they have just confirmed that they're working also on a Playstation Vita version of the game.

Both titles will be released this fall and will feature cross-save compatibility.

According to Siliconera:

"Sly Cooper: Thieves in Time picks up after Sly 3 left off. Sly is faking amnesia so he can be with his girlfriend, Carmelita, who’s also playable in the new game. When Sly ultimately ends up rejoining the Cooper gang on a time-travelling adventure, Carmelita finds herself in the thick of things, too.

Since there’s time-travel involved, you’ll get to play as one of Sly’s ancestors, too. Late last year, Sony shared that Rioichi Cooper, who was introduced in the first Sly game, will be playable as well."