Nintendo announced over Twitter that the demo for Super Smash Bros. for Nintendo 3DS will reach the North American and European Nintendo eShops on September 19.
Additionally, select Club Nintendo Platinum members will have a chance to get their hands on the demo early today. Nintendo will be send out four codes for the demo via email to select Platinum members.
Super Smash Bros. for Nintendo 3DS was released today in Japan, you can check out gameplay here. The game will be available on October 3rd in North America and Europe.