I remember that arch-designer Frogboy mentioned somewhere, a year or so ago, that he was aiming for truly epic, gigantic maps -- their size only limited by the amount of RAM the gamer had available. Considering that many players' computers now exceed 2GB of RAM, disposing of a 64-bit OS, I wonder why we are currently limited to those so-called "large" maps.
The stickied FAQ on the main forum home page notes that they are planning a 64-bit version of Elemental, but that it wouldn't be ready at release. So I'm guessing that the "huge" maps will have to wait until the debut of the 64-bit version sometime down the line.
I, too, hope that somehow Elemental will evolve into having random maps that are balanced for gameplay without having to resort to community map makers. If Civ 4 could do it, I have every confidence that Stardock can, too.