1. Most likely, it will be the original 13th century invasion.

2. Given that at least some of the new maps are coast maps, I think they'll include at least Tsushima island and possibly some areas in northern Kyûshû. But I don't know if they'll bother to add Settsu etc.

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"The right use of the sword is that it should subdue the barbarians while lying gleaming in its scabbard. If it leaves its sheath it cannot be said to be used rightly."
- Tokugawa Ieyasu: Legacy