Along with showcasing the final version of Super Smash Bros. on 3DS, Nintendo of America will also cover some upcoming Wii U and 3DS games.
The Nintendo Treehouse will host an eight-hour live stream on Twitch this Friday, September 12 showcasing several Wii U and 3DS games.
Super Smash Bros. for Nintendo 3DS is the only game that has been confirmed, and the Treehouse will be highlighting the final version of that game, which happens to hit Japan that same day.
Other upcoming Wii U and 3DS games will be highlighted as well. While no games have been confirmed, it's very likely that games such as Hyrule Warriors, due out on September 26, and Fantasy Life, due out on October 24, will be shown off during the event.