Ryu isn't the only thing from Street Fighter coming to Super Smash Bros. Nintendo announced that Suzaku Castle, considered Ryu's home stage in Street Fighter II, is also available today.
As you can see, the stage is pretty similar to the one seein in Street Fighter, but Nintendo says that playing it in Omega mode will make it feel "even closer to the stage from Street Fighter II." As for the details of the map, the right side provides "stable footing," while the left side has "smaller, separated platforms."
Additionally, in the Wii U version of Super Smash Bros., the background music can be changed between Ryu and Ken's themes.
Pricing can be seen below, while the details on Ryu can be seen here.