Keep Your Final Fantasy XIII Save File For XIII-2
Although details are scare at the moment, Square Enix's Yoshinori Kitase and Motomu Toriyama have indicated via Famitsu that something special is in store for players with a Final Fantasy XIII save file. What that means for Final Fantasy XIII-2 is completely undecided (even by the development team, it seems), but it better be something substantial. That game was BOR-ING.
Speaking of which, the developers stated in the same Famitsu interview that XIII-2 will better explain XIII's ending, and greatly expand on the character of Lightning as she embarks on a dark new journey.
At the very least, her new outfit is a step in the right direction, so maybe this sequel will be the game that the original should have been to start with.