Hmm... well, in X and Y, we've had this person give us an item known as Strange Souvenir, indicating that there's some new region in line for us; maybe this is the time we finally get to see it? If it does wind up to be true, I'd like it to be based off Sevii Islands. Would be great if it were completely open, where you get to discover new towns, caves, forests, routes, etc. by surfing from place to place. That souvenir was based after a Pokémon; perhaps this region could be the place for us to meet and capture it? I'm not really sure how it would actually look, though. Could be a ground or rock-type, since that item was brown in color. d: Aside from all this, I have no idea what other areas they could possibly have.