Capcom announced Street Fighter X Tekken for PlayStation Vita will have an extra twelve characters including Blanka, Cody, Dudley, Elena, Guy, and Sakura from Street Fighter plus Alisa, Bryan, Christy, Jack, Lars, and Lei from the Tekken-verse.
All of these characters, it seems, are already on the Street Fighter X Tekken disc, which might mean Capcom will release these fighters as downloadable content. Shoryuken has a videos of the Vita characters running on an Xbox 360 build. Also interesting is Pac-Man and Mega Man, which were announced as PS3 exclusives (the later revealed to be DLC) are found on the Xbox 360 disc. Capcom has not announced either guest character for the Xbox 360 version, even as downloadable content.
Street Fighter X Tekken comes out this Tuesday in North America.