Lea Monde is likely to endure an ill fate if it's to mimic its Vagrant Story counterpart. It's odd that it isn't located on the map itself though there's the possibility that the map is a fairly old one. Of course, it could be a very recent map and Lea Monde has already been plunged into chaos without us, specifically, being told. Either way, I wouldn't be surprised if it plays a part in 5.0 as a zone, dungeon or raid.