From Azrael:
Guess I'll post my Nakky blog notes as well.
Says that with Hakan reveal, ALL characters have been introduced (ie no more hidden characters, but as always she never says anything concretely).
Endless battle has no win limit, but the counter only goes up to 3 digits, so aim for 999 wins.
All chars unlocked from the beginning.
Casual clothes were considered for Chun-Li's 3rd alt, but the idea didn't make it in the end.
Colors and taunts have to be unlocked, but will be much easier than in SFIV.
Can search for region for online battles, and set region preference in Fight Request.
Characters who already had a remixed theme in SFIV will have the same theme in SSFIV.
Not every character has 2 rival battles. Some only have 1.
No facial adjustments/tweaking for the female characters.
The soundtrack featured in the Collectors Package is only character themes. So there are no plans to release the BGM for the new stages on CD just yet, but she notes that they would like to at some point.
Can't search for specific player data, or various types of BP ranking like the arcade, but there are two new rankings - BP by region, and BP by character.
She says that ultra select will take place after you and your opponent have picked your character, and that the blind select will be turned off. In other words, blind select pick your character, see each other's character, then ultra select. Yes, I know this is in contrast to what s-kill said, and I don't know why. That's just what she's written.
No offline replays.
Dev blog will talk about character adjustments...but not in too much detail.
No forced install, but she later notes that load times are faster overall.
No plans for SSFIV on PC at this time.
BP, GP, titles and what not do not carry over from SFIV.
Dead body hits are still in.
If you have a SFIV save file on your system, then there's an 11th color...
Matching is done based on Player Points.
No new features for Training Mode, except that the CPU will remember your settings.
El Fuerte's moves aren't any faster.
Color Edit mode wasn't possible.
Install on 360 will probably be about 6GB
Character country flags have disappeared because they added the feature to display some preset phrases before a fight - the country flags were in at first but in the end the screen was too cluttered.