Well each starting city has it's own storyline and as far as Limsa is concerned there are a lot of loose ends by the end of it and it will have to address those at some point. Whether we're pulled back to our home nation or if the story stays as it is and sends everyone to deal with them, we'll see what they do.

We're not sure how Grand Companies work, they probably won't be nation specific though as you can do the side-quests related to them for each city.