The Kingdom Hearts franchise thus far has been a story about the two protagonists, Sora and Riku, who find themselves holding the keyblade and going on an adventure in the Disney Kingdom. The upcoming PSP release, Kingdom Hearts: Birth by Sleep, will go in a different direction and will be somewhat of a prequel that focuses more on the keyblade itself. The game tells the story of keyblade warriors who existed before Sora and Riku's time, and it will be centered on three keyblade apprentices: Terra, Ventus, and Aqua.
If you've beaten Kingdom Hearts II: Final Mix, you've probably seen the secret movie that gives a sneak peek at the three characters. The movie was done in a realistic-looking CG sequence that didn't match up with the Kingdom Hearts universe, but for fans who are wondering if Birth by Sleep is going to go in that direction, don't worry. The actual game felt very similar to previous installments in terms of both visual style and gameplay.