Hope to see ingestibles on the caliber of Imps IMCN or PN or FWE. Else what's the point of having night/day cycle or even weather cycles now that we're getting rain and radioactive rain? Jury's still out on whether we could be getting snow in the colder climates. But this may not happen as it could be a performance constraint on the consoles.
IMO diurinal cycling implies an indication of the passage of time in the game. Which strongly suggests a need to sleep and/or regenerate health in the process. It would be painfully dull if it were 100% daylight the entire time. The fact nights (and dynamic weather/climate) exist, imply the hardcoe needs mode could be a hidden feature on the pipboy. Being within the vicinity of that radioactive sea area is definitely going to impact the PC health. And it would be very limiting game mechanic wise to restrict PC healing to use of instantaneously healing stimpacks. So I suspect hardcoe mode does exist, but that it will work the same way it did back in NV. Basically where it had to be enabled first in the menu before the needs were visible on the pipboy.
The game play is really going to svck if Beth leaves out the basic hardcoe FOD/H20/SLP needs. Additionally this should be an option as with NV to satisfy the achievement gamers and those of us who prefer greater sandbox immersion.
edit: By including the RTS feature, Beth definitely took note of the best talent the modding community showcased in FONV and F03. Hopefully they paid note to other immersion mods from other franchises like TES as well. Because it would be great if they included an enviornmental feature the likes of Chesko's Frostfall for Skyrim. This required the PC to drink and eat nutritious foods on a daily basis to avoid fatalities from dehydration, illness from disease, starvation, and environmental exposure.