Earlier this year Nintendo confirmed the development of a new game in the Fire Emblem series for Nintendo 3DS. Now they have revealed a new feature in the upcoming game called "My Castle" where you will be able to build our own village, interact with characters and then share it with others. The feature makes use of Street Pass and it will facilitate combat between players in your or your opponent's castle. You will also be able to recruit characters via this feature and buy weapons (different weapons available in the two versions of the game).
Fire Emblem If will be released in late June in Japan and it is planned for a European release next year.