These were the first 16 characters in SF4 artwork marketing. followed by seth, akuma, gouken, sakura, dan and rose who were in game (on disc).
Again same style artwork (different artists). will there be hidden characters on disc again?
you missed fei long and cammy
the tekken guys have been testing akuma long before they announced tekken x street fighter
they will release the same amount of characters they have in ultra through out the years guaranteed. they need to make money after all.
It will have balance updates and new characters down the line
and they'll release a version of the game that simply collects all of that on one disc down the line as well, the game will be a nightmare for tournament organizers otherwise after a while unless they do that
SF4 was released in arcades a full year ahead of the home console version. The original arcade version had only those 16 characters available, with Seth, Akuma and Gouken as unplayable bosses. That first picture is of the complete playable roster as of the game's launch.