To add: People will be forced to work with others in their region. Problem with this will be that NEXT round people will not be at the same coordinates.
One the one hand thats excellent, keep it dynamic. On the other hand it's annoying because you want to attack and defend with your mates. It could work quite well if you are planning on giving alliances an ETA advantage to eachother in defense. That would 1) hardcode alliance into the game and 2) allow people to continue defending with their friends to a certain level.
If this is the stuff R10 is made off, you're
almost tempting me to play serious again... almost