It looks to me like it is Continent sized world maps. They are likely randomly generated with the voxelfarm tech in house, then have a node map generated over that seed world from the ACE guys. They take the now processed "World" then distribute that to the players to compete over.
That gives them the base to slap down mobs, nodes, and objects and interesting places. Giving a random feel to the world but polished by devs.
I really would love if they stole the storybricks idea as well, (heirarchy of needs based AI) or some of Rifts Beta ideas. Having the nodes contested by NPC guilds as well as pc would be interesting.
Either way they are getting my money, just for having a new idea, but I still hate Ralph Koster.