Well I'm gonna name a few features that are gonna be in the game.

Guns (Be able to kill people and certain NPC's)
Day/Night System (hopefully)
Fully Customization (Basicly for your color of your clothes)
Get A Job to earn money ingame to purchase space, items, new clothing, houses, etc.
The Basic Needs We need (Hygine, Food, Bladder, Fun, Etc)

These are only some features...I'll add more to the list when I think of some more.