Bethesda can't make an exact remake of the locations in Daggerfall considering how large it was, but what would you want Bethesda to do? Would you want them to try to recreate it to the best of their ability? To recreate at least some of the cities? Or to just start all over again when designing the area? If they do include some cities, would you want them to be similar to how they were in Daggerfall? Would you want the actions of the player back in Daggerfall to be reflected in the new game?
I'd like them to recreate some of the areas, perhaps Daggerfall and surrounding areas, or Wayrest with the river Bjoulsae, Sentinal or Orsinium, though really my most desired location would be the Isle of Balfeira (which is actually a place you could be sent in any game easily since its an island) - Adamantine Tower would be great with current graphics.
The areas should be somewhat similar to their appearance in
Daggerfall, for instance the Sentinal Palace should be at least vaguely reminiscent of its
Daggerfall counterpart - that is, the themes of the cities should be kept in accordance with their surroundings.
Apart from the major events of
Daggerfall I don't think much should be kept, mainly because most of it was randomly generated.