Videos have been released that indicate Ryu from Street Fighter and Roy from Fire Emblem, who was previously a playable character in Super Smash Bros. Melee will be included as a downloadable character in Super Smash Bros. for Wii U and 3DS. The videos appear to be the classic mode victory videos, and the people who uploaded them claim they ripped them from the Japanese version of the game after an update.
Hackers also posted what they claim are alternate costumes which have been ripped from the game
Additionally, they uncovered Ryu's stage from Street Fighter II
Some sound files for Ryu and Roy were previously discovered in the game after an update, although there was nothing as definitive as these videos until now. This leak was discovered shortly before Nintendo's pre-E3 Nintendo Direct based on Super Smash Bros, and their E3 conference, where some people speculate that Ryu and Roy would be announced.