There is no hardcoe mode, Bethesda has never done a hardcoe on they're game(Fallout:New vegas was made by Obsidian)
bethesda could learn a thing or two form obsidian i think, but i think obsidian could learn a thing or four from bethesda (the map being, oh i dont know, not filled to the brim withinvisable walls, and have a ton of unaccesible unused space, for one)