The above picture is not modified high-resolution image for promotional use. It’s actually an in-game shot with resize, lighting and depth of field then applied to the scene so that it can be used as a desktop wallpaper. See Kotaku and Ninja Theory Forums for the original story.
I remember when I saw player face textures in NHL ’97 and thought “this is unbelievable”. Well, I guess I have to find another meaning for word “unbelievable”. Because this Heavenly Sword image is unbelievable.