I've always assumed that the countries had the same name as the capitals, since they seem to be city-states. Insomnia is probably the brand of the car or something like that, although it could be the name of the city itself if they decide to have some small villages around it to create a country, for example. Or even if they don't.
Regarding Altissia... Luna seems to be in Accordo, so either new name, name of the capital or different place.
I wanna see the map, too, I'm a sucker for maps. I think they'll give us something like XII, a huge continent or groups of continents in which we "only" can explore parts of it; otherwise it wouldn't be feasible.
As long as the world's interesting, big, well connected and full of details I'm golden, since I don't want a full planet to explore in which there are only a couple of countries and cities. As much as I love VIII and IX and their worlds are my favourite in the series, they lack that in comparison with Ivalice, which feels a believable world.