A game in Hammerfell or Black Marsh would be cool too.
I think Black Marsh lorewise (environment) is hard to put in a Elder Scrolls Game as the single province. My beloved Valenwood as well :'(
Hammerfell seems like a definite possibility though.
I'm guessing 4E200-500, probably around 4E210-270 though.
(Skyrim is 4E201).
This!
Though I would prefer a new setting, namely that of Akavir.
First they gotta do Black Marsh or Valenwood, before I allow them to make a whole game about Akavir. A DLC playing there would be nice though.