The download version, as an early purchase bonus, the theme of "Animal Crossing Happy Home Designer" of the download number is attached to the August 31, 2015 (Monday). (This theme is done and pay sales from September 1, 2015)
The Japanese website for the to-br-released Animal Crossing game "Happy Home Designer" has shared information that the first grouping of people to purchase and download the new game will get afree Happy Home designer 3DS theme to personalize their 3DS console screens with, and to match the brand-new game they just got. I think this is quite a freebie considering the game it'self will apparently NOT be free, however this freebie may not be available in all regions considering it was shared on the Japanese website first and not on the North American site. I found out about this freebie from my feeds of Nintendo news and wen't to the Japanese site to translate it with google and find all the information in great detail, still, this free theme may not be coming to the Americas or other regions at all.
Source: Japanese Animal Crossing website Game on and Keep it Rehl!