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There is no rich game world world which does it all - lots of NPCs, vehicles, richly detailed interiors of buildings, where the fundamental environment can be changed by the player's actions. The reason for this is because many of these things, like fully adaptive AI NPC pathing and combat techniques, along with inherently better physics are computationally expensive and because a rich changeable game world requires a leap in console storage technology so changes to game environment can be saved and re-loaded later and don't disappear when you get 100 yards away or turn a corner because it's flushed our of RAM.Again, all of that exists, there is no revolution in game play. The fact that more developers may or may not make use of it doesn't change that it's already here and has been here for years.