I don't know if they have changed plans since then, but I remember taking these notes from April 28 -live letter.

Q: Can you please give us more info about moving system?
A: To move, go to the land you want to buy and buy it. If you already have land/house, it'll give you a text pop-up asking if you'd like to move your house and relinquish old land. If the land is same size as the previous land you owned, the house will just move. If the size is different, all of the furniture will go into warehouse reserve so that it is not lost.