Now nothing has been said but it's cool to just think about what could come out next.
My thinking is West Skyrim as the setting and Necromancer class as the next "big selling point".
Why? Customers been dying to see the rest of Skyrim in ESO and if they were to do another class, most suggested is Necromancy. Also, because I want this.
Where else and what else could the next Chapter be? Remember, ZOS likes to do opposite of the previous Chapter according to Matt Firor in his recent interview, Hence the reason we got Summerset which exact opposite of Morrowind on the map and if they cross the map again, it could go North since we are just getting Murmire in the East. Then later they'll go south and explore Elsywer(probably spelled that wrong).
Or they could make another huge daedric plane since there's plenty of room for that.
Was there any indication in the summerset story or the murkmire story that suggests a place?