but why should people care if its instanced or not?
In most of the newwer mmogs it seems that you just get a small group and go level grind, ignoring all other people, except when in a city.
From what I understand, with the traditional MMO's that have instanced zones, those instanced zones account for only 5% to 10% of the 'game world' whereas GW will be the opposite with 5% to 10% of the game world being a common place and the rest of the game Diablo style with 8 players. So with your EQ's and the like most of the game is still all common areas with certain quests and dungeons that are instanced. Sounds to me like GW is almost all instanced with the oppurtunity to grab 8 friends and go to the arena and fight other 8 person guilds.