Square Enix has released the first trailer for Lightning Returns: Final Fantasy XIII, which features both gameplay and some of the story information.
The setup goes something like this:
There are 13 days until the end of the world, and Lightning must face the minions of darkness all by her lonesome. The attacks are mapped to the face buttons so it’s essentially an action game with health bars and magic now, and as Lightning is flying solo, there is no party. She can also jump and evade and generally move freely about the environment and at one point, she’s got herself a slick pair of sunglasses, which somehow fit her new outfit.