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After a long wait, the development team at Nintendo has finally announced that it plans to launch the Wii U version of Super Smash Bros. on November 21 in the United States and on December 5 in Europe, with gamers able to also get the new Amiibo figurines in late November on both major markets.
Until then, fans of the series will be able to play the 3DS version of the title, which shares some characters but has different gameplay mechanics and a line-up that includes some different characters.

The information comes from the official site of the game and from a trailer which has been apparently posted a bit earlier than the company expected.

Rumors, including listing on online stores, have been talking about a November 21 launch date for Super Smash Bros. on the Wii U in the United States, but no one was expecting for Nintendo to introduce a two-week delay for the European market.

Probably the move is designed to make sure that the company has enough copies to satisfy initial demand in North America before it needs to also deliver big shipments to another continent.

The title is seen as the big launch which can boost sales of the Wii U home console all over the world and make it competitive with the Xbox One from Microsoft and the PlayStation 4 from Sony.
Wii U versus 3DS
The 3DS version of Super Smash Bros. was launched first on all markets because the amount of bugs that the Quality Assurance team had to deal with was very high and one of the titles needed to be prioritized.

At the moment, the currently available version of the game has sold very well in Japan and will probably also do so in the West, where some stores have been reporting that they are running out of copies.

Nintendo has said that it has carefully chosen the characters that are included in both titles and that the core mechanics have been redesigned in order to attract a wider number of players while also keeping long-term fans satisfied.

For the first time, gamers can create their own custom fighters.

Super Smash Bros. will also get a lot of support from the development team in the long term, with updates that are designed to fix any issues that the community finds and reports and downlodable content that can add new fighters.

Super Smash Bros. for Wii U & amiibo - Trailer