Although Masahiro Sakurai’s Super Smash Presentation was meant to come out tomorrow, a misunderstanding on the Japanese branch of Nintendo led to the people getting clips of the Street Fighnter character joining the fight a day early.
In Japan, Nintendo accidentally released the patch that Sakurai would reveal in his presentation. As a result, data miners were able to go through the patch and find of a variety of characters and stages that would soon be released. Ryu was one of them. You can cop Super Smash Bros Wii U/3DS in stores today.