What you see above is a mod showcased by Super Mega Buster 123 Win64 Gigabyte, and actually created by KevintheH. The mod swaps Ryu's model with Goku textures. See video below:
Impressively enough the mod's only in 'beta', but already manages to sound much like Goku. This isn't the first display of effective character swap mods. In the past we've seen the likes of Samus and Captain Falcon swapped for Iron Man and Captain America.