I was reading somewhere that within the game itself is a pre built land from some elder scrolls game (I dont know which) but it's already there to be populated by dlc...
I was thinking about sum mothership zeta expansion... perhaps u come across a cave with ancient drawings of ufo's and all of a sudden your beamed up to the mothership

:)

:)
wherever the story goes from there is anyones guess, but there's an idea if sumone wants ta mod it.