Sorry for the double post.
Anyway, I've been thinking and planning quite a while about the sequel. I've had some trouble deciding just what to do with the world, but I have finally finised the basic plan. The entire world, and even the entire continent, will not be accessible. It's just too big. Rather, we will have access to all of Ivalice's direct neighbors. With the map we were presented in FFTA, we know that Ivalice is a peninsula with only a single northern border. There will be three countries to the north of it, and a group of islands to its southwest. Each country has its own government. Goltana, the main aggressor and the largest of the countries, is the westernmost of the continents. The other two countries along Ivalice's borders are not fighting in the war when the game begins, but that changes soon. The country to Goltana's west is the one, besides Ivalice, most threatened by the attack. It blocks off all but a small portion of Ivalice from direct invasion by Goltana, and both countries will have their movement restricted by those borders. Thus the middle country (for which I have no name for as yet, Goltana is the only one I've named, but I'll listen to any suggestions) is will take sides the quickest. Siding with Goltana would help to ensure victory over Ivalice, but also leave itself vunerable for an attack from two flanks, and could bring the other country into the fray. However, siding with Ivalice would involve facing down the might of the strongest nation on the continent. The easternmost of the three countries has little cause to worry. Both Ivalice and the middle country are blocking it from Goltana's aggression. And who knows, it might have desires of its own in this war...
However, the neutrality of the other countries will in no way make them immune to the war, and a good portion of the missions will be fought inside them, as Ivalice will be trying to gain their support in the battle against Goltana, and Goltana will be doing everything they can to prevent it. And, as I have said, the political positions of these countries are unstable at best. There will even be some three way battles between Ivalice, Goltana, and the others as the game progresses, which will be more difficult, and require more strategy. Playing the sides off against one another will require careful manipulation of the battle, but will wind up being far better for your forces than attempting to take on two armies at once!
The islands are not a definite country, rather they are going to be a storehouse of optional quests and items. They will be inhabited by some of the strongest foes in the game, as well as the most rewarding quests.
The Redwings will make an appearance as well. Though they have suffured a staggering defeat at the hands of Ivalice in the past, having lost Grissom, Gukko, the Foreign Fiends, the Falgabirds, and countless others, the organization itself still exists, and is waiting in one of the countries for the chance for vengeance.