The PvP gameplay of Eternal Crusade uses instances but each location is unique. . There will be some exceptions, for example the PvP missions will be duplicated, but this is not the general rule.
The continents will be built in order to support the future open world experience patch. In the meantime the world will be divided into small unique locations which will be played as matches. Only one match can happen at one given location in the world and the result of the match will change the world for everyone. The only exception will be the PVP missions which will be instanced.