Square Enix lists release of FFXIII: Seasons, new name or new game?

Yet another Final Fantasy title has popped up; Square Enix have listed the release of Final Fantasy XIII: Seasons on their UK release schedule. The new title hasn’t been heard of before, but could well be a new name for the PSP title Final Fantasy Agito XIII which isn’t on the list of games that also includes Final Fantasy Versus XIII, XIV on PS3, and Dissidia 012.

If not a rename, could this be the rumored Final Fantasy XIII sequel?