Nintendo have revealed that Club Nintendo members who purchase Super Smash Bros., for both the 3DS and the Wii U, will be eligible to receive a free limited edition soundtrack.
Purchasing both versions of the game and registering them on Club Nintendo during the promotional period, which presumably will run from the launch of the game, on the 3DS and then the Wii U will bag you this 2 CD pack. The soundtrack contains stacks of tunes from both games, but also features tracks inspired by those of the actual character roster and the Nintendo worlds they originate from.
This CD will not be made available for purchase and will likely be found doing the rounds on the likes of eBay for a small fortune, as many other Nintendo soundtracks can be found doing so. I would make the recommendation to all Nintendo fans to make sure they get their Club Nintendo codes redeemed immediately!
Super Smash Bros. will be available on October 3rd for the Nintendo 3DS and in the Winter for the Wii U.