Just a speculation thread to guess at what new areas might be in store when an expansion is announced:

*Radz-at-Han. That oil isn't of the current regions we know about, so that may be a new region entirely.

*Ishgard and the rest of Coerthas. This might lead us into the introduction of Shiva given what we know about the change in climate from 1.0 to now.

*Ala Mihgo. Turning back the Garleans would certainly lead people to believe this area will become available.