Nintendo are to hold another Direct Conference on 27th December to announce some new details about the 3DS. The previous announcement revealed the 3DS will be updated with DLC support in the December update although no games currently support it.
Japanese publication Nikkei however are reporting that Nintendo are set to announce the first game to support it will be Fire Emblem 3DS and will be available sometime in March. No details were given on what the DLC items could include, most likely new maps.
This news also narrows down the release date game will be released in Japan somewhere between January and December!