When The Legend of Zelda: Ocarina of Time 3D was released in 2011, Nintendo offered a special bonus for early buyers: those who registered the game on Club Nintendo would receive a physical copy of the game’s soundtrack. For the upcoming Super Smash Bros. games, Nintendo is doing something similar.
Today, Nintendo announced that when both Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U are registered on a user’s Club Nintendo account, the user will receive a free copy of both games’ soundtracks by way of a two-disc CD album. While no specific details have been given other than that, the promotional offer for Ocarina of Time 3D was only eligible for a limited time, and copies of the soundtrack were in short supply. A placeholder image of the soundtrack can be seen above.
Super Smash Bros. for Nintendo 3DS will be released on September 13 in Japan, October 3 in North America and Europe, and on October 4 in Australia. Release dates for Super Smash Bros. for Wii U have not yet been given.
Source: Official Nintendo website
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I would think the games feature a lot more music than two CDs would be able to hold, if Brawl was any indication