It looks like Square Enix didn't waste time dropping the bomb, as Final Fantasy XIII-2 has been announced at the Square Enix 1st Production Dept. Premier Event.

It will see another game focussing on the story of Lightning, as apparently, a sequel has been constantly requested by fans. It's a nice reason, but I highly doubt they made the game due to fan feedback.

It'll come out on the PlayStation 3 and Xbox 360 and according to Toriyama, it will be out in Japan during 2011.