When you log in have a look at the daily update about the tournament maps.
In this screenshot, you can see a level 100 player with the usual silver star in an alliance with 4 other player's bases, 3 of which have gold shields and 1 of which has a gold star that is level 30.
What's the go? Is this simply an artist adding a little colour? Or are we soon to get another type of colony, one which does not share level with us, and can be put down on the map separately to our main base.