Q&A de Toriyama y Kitase con Gamasutra -> http://www.gamasutra.com/view/news/35385/Qamp_A_The_Real_Story_Behind_Final_Fantasy_XIII2.php
Algunas frases interesantes:
This new game is more player-driven, as opposed to story-driven, so that you can explore different locations and fields to get information and explore towns and other types of locations, as well.
It's only that because there are lots of ideas and content that we could have included in XIIIwhere we didn't; but we didn't actually recycle any of them for XIII-2. It's certainly not that XIII-2 came from the idea of how to make any use of the rejects; that's not how it happened.
XIII-2consists of two parts. One part is the elements and parts that we created from scratch, and the other part is that we took the basic materials from XIII, like the characters, universe, and locations; but every single aspect has been revised or has had new some elements added into it.