In a pair oftweets (translated by Siliconera), Sakurai said the recent rumor is false and the official release date for the new Super Smash Bros. game is sometime in 2014, as Nintendo has said previously.
Nintendo has yet to reveal any footage from Super Smash Bros. on the Wii U outside of a video demonstration from E3 2013. Nintendo is developing the game in partnership with Namco Bandai's SoulCalibur studio.
As of September 30, the Wii U has officially sold 3.91 million units. The company plans to sell 9 million consoles worldwide by the end of March 2014.