Please explain the games replay value. Or map

Is this game going to be like dishonored. So it will have multiple ways to play and good replay value maybe. Or is it a one time playthrew and your done. How huge is the map how much is their to do and explore. Is this open world sort of or is it story like dishonored and then maybe you replay it but you probably don’t.

Well, from what I read is that the game will have multiple endings based on how you play and what choices you make. Also they have stated that you can play the whole game without killing any of the NPCs which I imagine will have an affect on the story.