Club Nintendo offers Super Smash Bros. soundtrack
Club Nintendo, the portal that rewards players with free games on a monthly basis assuming they register their new Nintendo games, will be offering a 2-disc soundtrack for Super Smash Bros. The only catch is, you'll have to buy both the 3DS and Wii U version and register them on Club Nintendo.
There aren't many details beyond that, such as if the soundtrack will include every single song, or if it's just a larger sample from the overall soundtrack. There is also no word on whether the soundtrack will be in limited quantities. However, the page does say Check Back Later for More Details.
However, you can get a small taste of the soundtrack right here, which includes 9 tracks.