I doubt we go to a territory in an expansion that is anything like Skyrim, climate/geography wise. If it were Atmora, it is a continent they could definitely do (if they so applied themselves). If we went to the northern continent of Man, I presume it would be rather alien to Skyrim. Giant crystalline glaciers and jagged ices. Fluorescent frost pillars and something you'd find in northern Solstheim. Karstaag's domain.
I doubt we go to any territory we have been to before, Morrowind on up, per Bethesda's own word.