Based on a discussion on Equestria Daily http://www.equestriadaily.com/2012/01/discussion-you-are-now-princessprince.html
Princess Celestia has found the solution to Equestria's overcrowding problem. Send 180 ponies to a new Equestria on the other side of the planet! Moon Dust finds herself in charge of this new civilization and has to make this new place home for heaps of ponies.