A list of the current features (the ones I can remember)
Day night cycle
moving sun and moon
clouds
rain and snow
lightening
randomised weighted loot spawns
randomised zombie spawns
animals
replacement inventory system
hunger that can be satiated with tins of food, or meat from animals
thirst that can be satiated with cans of coke, refillable canteens or water fountains
trees which grow daily
a working, 4 person car, complete with radio and fluffy dice
The car can be built and repaired with pieces of other broken cars – wheels, batteries etc
petrol from petrol pumps
exploding gas station
replacement weapons and items like binoculars.
Multiplayer
A system for sending messages to nearby players without it going to ones that are further away
dogs that can be tamed by feeding them
ability to dismember zombies and eat them, or use their limbs as weapons
smashable glass for the hospital and house windows.
the ability to get ill, or sick, requiring antibiotics
breaking limbs requiring morphine
bleeing, and the bandages to stop this happening
crashed helicopter with loot
voxel decorations like tills, chairs, tables etc