Street Fighter's Ryu, Fire Emblem's Roy spotted in Super Smash Bros. patch - rumour
Street Fighter's Ryu is rumoured for future Super Smash bros DLC following datamining of the latest patch.
Super Smash Bros. 3DS and Wii U were updated recently, and hacker shinyquagsire23 claims to have found some interesting files while poking around in the 3DS patch data.
As detailed on Reddit, the audio files included a new stage theme named "ryu", which turned out to be Ryu's stage theme from Street Fighter.
There was also a Fire Emblem victory theme named "roy", and a couple of Kirby songs were found. This last one is a bit mysterious, since Kirby is a current cast member, but may relate to a new stage.
Polygon got in touch with the hacker, who said it's very hard to prove the data is legitimate, of course. They also commented that there are no other references to the data beyond audio, and the files may be scrap.
So, in short: don't get your hopes up too far. The original Super Smash Bros. release was littered with files which turned out to be from cut content, so even if these could be verified, it's possible Nintendo has been experimenting and doesn't mean to pursue these leads.
On the other hand, we do know more DLC is coming. Hmm!