Actually, he did provide a tentative world map (the kind you can get by pushing F10) in the modding thread a few months back. Even if it's slightly out of date we might still be able to use it. That map has "updated" borders for Europe, Asia, and I think most of Africa as well (we can probably infer the rest from the story and in-game screenshots). As for the Americas, I don't think he ever discussed that in the modding thread but we could still use the default Sunset Invasion converted scenario (super-Aztecs and super-Incas plus other native blobs) as a template. Australia I think it is safe to say is still uncolonized. There's also a basic mod that includes only the provinces of the Imperium and its neighbors.