The fact that there are some places not exploreable on the world map. Each main character has something weird happen to them in Lucis (Gladio), Accordo (Ignis), and Niflheim (Prompto) respectively. In each place, we are prevented from going somewhere specifically that the map may or may not contain in later updates. Lucis technically has Galahd to the north of Cleigne. Altissia has a ton of it not really up for exploration, including the region of Ravattriice, which is on the cliffs surrounding the city. Niflheim is barely exploreable, but it looks like Cartanica, Tenebrae, and Gralea have some areas that should be exploreable. Either that or he goes through some snow town after he gets tossed off the train. Now whether you feel they did do this on purpose (I feel like some plot lines were cut short because of it) or not is another story, but this is my take on it. They did say that they want to open up the map even more and add more content. I'm just hoping that this expends to the entire party when you take control of them as well. I also hope the DLCs focus on the bros relationship with Noctis before the story, similar to brotherhood. I think a little exploration in Insomnia would be great as well (obviously not all of it). Perhaps the insomnia story gets completed fiully after playing all 3.