Bethesda has never done a "hardcoe Mode." I wouldn't hold your breath.
Wait a few months and I'm sure someone will make a mod for it. Personally I prefer the new "Survival" setting. The sustenance meters were just added little bits of tedium, so I'm fine with seeing them go, whereas the feature of hardcoe Mode that I actually liked (more challenging combat due to no longer having access to instant healing) has not only been retained but actually intensified, stims heal very slowly on Survival even compared to NV's hardcoe.