During an interview with Square Enix Members, Motomu Toriyama said that the follow-up to Final Fantasy XIII will have a storyline that is easier to understand, and they learned from XIII's difficulties to explain complex concepts in the universe.
“As far as the story of Final Fantasy XIII is concerned," Toriyama said, "the most important mission for us was to express the game’s unique universe — including l’Cie and fal’Cie — and therefore some difficult terms had to be used in the story-telling. We have taken a lesson from it and employed a different story-telling style for Final Fantasy XIII-2.”
“The basic elements of the Final Fantasy XIII universe continue to be present as the backdrop while the story now centres around Time Paradox, a more familiar form of mystery."
“Meanwhile, we have taken strong inspirations from one-shot TV dramas and opted for a different plot structure where smaller pieces of drama take place quickly one after another. As a result of these changes, the Final Fantasy XIII-2 story has turned out to have a glimpse of a more contemporary drama and is easier to follow in comparison to Final Fantasy XIII.”