AI players learn AI to control players whose connection is broken down or makes a time-out in combat. Real ecosystem Weather changes The sea moves. True behavior models for animals Trees grow and reproduce. Diplomacy Perhaps players will associate themselves in kingdoms, electing kings. Really big world.
Modifiable terrain Can hide items under the floor or inside other items.
Cyberfreedom You are not going to banned from a server for not behaving in the correct way in the game. Secure client and server. No real world wars here. We are all brothers, no distinction between us. Cheating It isn't going to be allowed nor tolerated, if you are caught cheating you are going to be kicked out of the server and your possessions given to the local lord.