Yeah, I would take a DLC similar to the Royal Pack for Niflheim for Chapters 9, 10, and 12, and maybe 13, with Cartanica becoming a semi-open world area for Chapter 10. For Chapter 12, they could give us a small section in Tenebrae to explore, and the Dungeon they added to Ghorovas Rift in the Pocket Edition, and with the build up and the first phase of the Leviathan fight being changed to match the one in the Pocket Edition in Chapter 9. For Chapter 13, they could integrate the cut Ravus dialogue, and show Gladiolus, Prompto, and Ignis' escape from Gralea, giving us a section of Gralea to explore while escaping. But only time will tell what will happen.