I still feel as if there is a rather, perfectionist, "afraid of nooblets" outlook you guys have, you seem to be very untrusting in our capabilities :P.
Like with walls, whats the big deal? Sure in the MMO side preplot is a great idea for making sure there isn't ridiculous levels of wall or building spam. But for offline skirmish or campaign...you not going to give us just a little bit of freedom? Go on!
Anyways, last I heard maps can and will be massive, not to mention the MMO world map, that certainly look huge! Especially if its seamless and streaming