I imagine, with the way things have been setup regarding Yda and Papalymo, Ala Mhigo and it's environs (possibly parts of Garlemald) will be the next "big step" for us as far as new areas go. I wouldn't be surprised if that includes the islands south of Ala Mhigo, since AM looks like it's got at least some access to the eastern coast of Eorzea.

I also wouldn't be surprised to find some Garlean influence there. Control of shipping lanes and all that.