Disclaimer: this is a theory based on the recent release of Street Fighter: Assassin’s Fist. It is not based on any statement by Capcom or any leaked info.
Disclaimer 2: this thread contains spoilers for SF: Assassin’s Fist, the new web series OK’d by capcom and produced by Machinima.
Based on the contents of SF: Assassin’s Fist (an awesome film for any SF fan), it seems possible that Goutetsu is a hidden character in USF4, or at the very least his moveset is determined for a future SF game.
The series stringently adheres to video-game movesets for special moves. However, the show gave Goutetsu very specific moves during his fight with Akuma. Goutetsu hasn’t been playable in any SF game to date. As a result, you’d expect the creators to stick to generic Ansatsuken techniques (hadouken, tatsu, shoryuken) to stay safe with lore. But they didn’t. Gouken used a bunch of moves you wouldn’t necessarily think he’d have, including two brand-new moves.
This represents the only would-be departure that the series makes for character movesets. Which makes it possible that Capcom actually told the creators what Goutetsu’s moveset is or would be.
He uses the following moves during his fight with Akuma, enough to fill a movelist:
(2) Gouken’s Senkuugoushouha - although he doesn’t say the name of the move, he does the exact same motion as Gouken does throughout the series
(3) A spin-kick where he shouts “Tatsumaki” alone ala Ex-Tatsumaki Senpuukyaku.
(4) A new move whose name I didn’t catch, but it was something-puukyaku. Possibly a super or a variation on Tatskumaki Senpuukyaku, like Gouken’s Tatsumaki Gorasen. He spins the opposite direction in the film.
(5) Metsu Hadouken. Likely Ultra 1.
**(6) **A new move called “Metsu Koushouken(?)” - it looks like Senkuugoushouha, but when he connects purple energy (looking the same as the energy that comprises Metsu Hadouken) flies out of his palm
Obviously this isn’t hard and fast proof. But it could be a big hint. The show is scrupulous about following the game for other movesets. Goutetsu’s moveset either is a massive deviation from this pattern, where the creators took extreme liberties in an otherwise very canon-reserved film, or is actually what Goutetsu’s moveset is. And if Capcom fleshed out his moveset already, it would be for USF4. That makes me think Goutetsu is hidden in the same way Oni and Evil Ryu were hidden in the original AE release.
I’m not claiming this is hard proof. But it’s a neat quirk in the series that I hope is a teaser for enormously cool things to come. Please have fun discussing whether you agree/disagree that this is indicative of anything.