Did you know Motomu Toriyama worked on FINAL FANTASY XIV: A Realm Reborn? Well now you do. As revealed by Naoki Yoshida at Tokyo Game Show 2013, the Lightning Strikes event that appeared in FINAL FANTASY XIV: A Realm Reborn in collaboration with LIGHTNING RETURNS: FINAL FANTASY XIII was written by Motomu Toriyama himself. Big thanks to goldpanner for translating it.
According to Yoshida, Lightning is not simply paying a visit to Eorzea: she is carrying some sort of destiny on her shoulders. The scenario is a full-blown affair that was also created by Motomu Toriyama himself, so apparently the plot will be meaningful in some way. Perhaps the story will be related to Lightning Returns in some way. In any case, we are looking forward to whatever it is about.