Haven't played a Street Fighter game since Ultra 4 (which I sucked at), but this game looks so freakin' good, so here's my wishlist, some of which has been confirmed:
1. Stick with the more realistic style. Give the newcomers more realistic moves (especially their supers) while all the returning characters would have all of their iconic moves. Design wise, I hope every future character also maintains this realistic style.
2. Have the story set in 2023. Street Fighter's story, from what I know, started in 1987 and ended in 1998. That means SF4 and SF5 were set YEARS before they were released. The story of 6, IMO, should be about a new generation (newcomers+Luke) learning from "the old guard" (veterans).
3. Aki appears to be the new villain, which means we have our first female main villain! (Juri doesn't count. She was always a sidekick to somebody else) That said, I don't think her goal should be world domination. Maybe something more realistic, like taking over Metro City? Of my wishes, I admit that this one likely won't come true, which is fine. I don't really have any problems with another world conqueror.
4. Luke should be the new Ryu, Jamie should be the new Ken, and Kimberly should be the new Chun Li. That thumbnail for the announcement trailer? Make that the box art. Jamie and Kimberly should also be playable in the story, just like Luke already is.
5. No rock n roll on the soundtrack. I don't see that genre fitting this game's aesthetic.
6. Cross-platform. Without it, the scene won't last long.
7. Some characters should get minor tweaks to their current designs, like Chun Li and Marisa.
8. An easy to understand system when it comes to super moves. IMO, they should use a level based system. Think something like the supers in Marvel VS Capcom (though they were called hypers in that game, but whatever).
9. If Aki is NOT the villain, JP should be. Based on what I know (and I know very little), JP has psycho power. Did he have a relationship with Bison before and during the events of SF5? That said, his goals should also be realistic.
This list will be updated if/when I have more ideas.