Expanding the role of nature is essential to the immersion of H1Z1's survival aspect. Wolves, deer, and bear roam the countryside, getting into the occasional tiff with each other and the undead. They're useful if you can take them down quickly, since the harsh elements (such as rain and snow) will soon be programmed to degrade your well-being and those animal pelts could be made into clothes.
Whisenhunt walked us through the four essential stats to staying alive in this world. Stamina is for sprinting and attacks, and while it regenerates quickly, neglecting it will ensure your body will draw from your hydration and energy levels instead. Your health is also constantly ticking down and replenished by the food and water you drink, meaning that you'll always need to be looking for more to scarf up and quaff in your journeys. Stashing your food in your backpack is a good option, although the team is still tinkering with the style of inventory to make the limited storage another survival factor.
When H1Z1 goes into early access later this year, there will be one "vanilla" server on which no punches will be pulled (this is doubly true as all players will start with only their fists as weapons). Other types of servers, such as player-only or PvE rulesets, are possibilities once the team assesses how players are engaging the game in beta.