2920 vol 09 - Hearth Fire: seems to be an imperial story. It mentions Black Marsh, Cyrodiil and High Rock - the latter two multiple times. Also mentions Morrowind a lot.
This gives me hope.
Speculating is fun...
Past expansions where named after:
Places: 1 - Shivering islands
Factions 3 - Tribunal, Knights of the Nine and now Dawnguard
Events 1 - Bloodmoon
Hearthfire may be linked to the name of a certain event (past or present) which happens during the month carrying the same name.
Where will it happens and which event, this is only speculation
I sincerely hope we'll see more lands in Tamriel and not some other conveniently made up Oblivion mini-verse. I still believe those roads leading to the borders were created for a purpose because Bethesda had already some vague ideas about the expansions. Otherwise, the complete absence of a road to High Rock (a neighbor province) cannot be explained while there are two roads (paved, even!) to Morrowind and one to Hammerfell or possibly Orsinium