Famitsu has a preview of Final Fantasy XIII-2’s time travel system known as the Historia Cross in the game. Before we get to that, the magazine also shared the game’s prologue calling Lightning "she" during the introduction.
"She" fought against fate and challenged false gods. That battle changed the world. The power of the gods vanished, Cocoon fell from the sky, and mankind is living in peace. Now free from the tyranny of the gods, a new era has begun. However, "She" is no more and vanished after the battle. Everyone gave up hope and believes "She" is dead, except Serah Farron.
Three years passed. Suddenly a meteorite crashes and the calm days come to a close. A distortion from space-time opened a portal to another dimension. Invaders rushed out and Serah is saved by a young stranger called Noel. He tells Serah he’s a hunter from the future who drifted through time. The two set of on a journey through space-time because "She" is waiting.
"She" is Lightning and now resides in a world with death and disorder rule. Lightning once saved her beloved little sister, now she protects a goddess’ temple. With a weapon in hand, Serah moves forward hoping to find her older sister.
Noel tells Serah they can open gates by collecting out of place objects known as "O Parts." Once you open a gate a compass of space-time appears and you can use the Historia Cross to pick a period and location.
Both screenshots below are of Bresha Ruins in different time periods. AF5 is on the left and Bresha Ruins looks like a lush environment. In AF300, 295 years in the future, Bresha Ruins has changed radically into a wasteland. It appears chocobos evolved to survive the harsh conditions.
Check Famitsu to see screenshots of Lightning in Valhalla crossing swords with Chaos Bahamut and an unknown man.
Final Fantasy XIII-2 comes out for PlayStation 3 and Xbox 360 in Japan this December. Square Enix have the title slated for January in North America.