I had seen the update changelog and it seems they changed alot V... I hope we will be able to load older world but no guarantee man... http://www.reddit.com/r/edstonehelper/comments/p6lol/planned_for_the_next_update/
If we can load old world on 1.3 there is nothing we would have to do... we can import the structures to the new world... if we cant load older world then its a problem.
I have successfully moved the city of Denmark to new world I'm quite happy about this.. So if you had a house in the old Denmark, you still have that house, without any chests ofcourse.. @nomy, please don't delete old world untill tomorrow noon. I still need the stadium..