In Fallout 3 I don't use fast travel while I'm actively doing quests, but I use it to collect my loot stashes to bring back to my house and sell/trade.
Awsome sauce. But where will the meters be? On the HUD or pipboy?
What I saw when I played it at QuakeCon, on the status page of the Pipboy there are three new pages, like J. E. Sawyer said, H20, FOD and SLP. They looked just like the meter on the RAD page. I only turned hardcoe mode on for a few minutes, since they gave you so much gear and ammo, you couldn't move, so I turned it off rather than figure out what to drop.
What I want to know is at what rate they deplete. Do water, food and sleep reserves deplete based on the game's time scale or real time. Do they deplete at a fixed rate, or do they depend on your activity level? I play on PC, and I set the timescale to 12 (2hr day) vs. the default of 30 (48min day).
How realistic is it? When your food, water or sleep is depleted, do you just die instantly or incur some penalty? Realistically a person in good shape can go several weeks without food before dying, but only a couple of days without water. But that's just sitting around, not doing a lot of running around in a desert, carrying hundreds of pounds of loot. In hot desert conditions, being active, you could dehydrate in a matter of hours without water, but still go a few days without food before killing over dead.
Can some items like Nuka Cola (caffeine) or chems (jet, psycho) prolong your sleep needs?