I'm not sure if anyone else explored PVE fully. I believe I covered all the beta weekend zones that were made available and my World Completion said 25%. That may give us an idea of how big the world is on the map.
However, if there are zones that are not implemented in the game yet, this may be a percentage of the zones that are currently active. So, the value may be skewed. I'm hoping this is the case because it feels a little small.
Krisanna Wilfire / Magi Stormsurge