Playing as Juri is an absolute blast. I sense a new main, because she's just a ridiculously enjoyable character all around.
A shame they got rid of Player Matches. For one-on-one invites, it looks like you need to set 'em up through Endless Battle now. Keeping track of win/loss stats is a bit more cumbersome as a result.
I had already installed the game on my PS3 drive. And while I obviously can't verify if users had done the same, every random online match I came across so far loaded MUCH faster than the original SFIV did without people doing the install.
Hadn't quite realized how much I DIDN'T miss the bonus rounds. They really are just speed bumps on the road to the fight. Luckily, you have the ability to turn them off after going through them for the first time.
Got original SFIV save data on your drive? Upon loading up Super, two unlockable colors for every character will open up automatically. They're more like filters, though. In addition, any of the DLC alternate costumes you purchased for original SFIV will transfer over to Super. Of course, Capcom will be charging for their all-new set of Super alternative costumes.
So, the way the character themes work is this. You need to first beat the game once. Not certain if the difficulty level matters, but I did it on Medium. (Be forewarned, Seth *is* still a massive headache to defeat.) Doing so opens up a bevy of unlockable options, chief among them the ability to once again set the character voices individually to English or Japanese - as well as Arrange BGM. (The game doesn't explicitly state that this option was unlocked - but it should be there in the Sound Options.) Turning Arrange BGM on will allow you to hear your online opponent's remixed theme. Presumably, the theme your opponent will be hearing on their end will be that of YOUR character - but I'd still like to confirm that with someone here. If either player has Arrange BGM turned to off, then it should be the regular stage themes that play up on your respective games.
Regrettably, the character themes aren't featured in Arcade Mode - just during the Rival Fights. As for local VS mode, that's a good question. I'm venturing a guess that it's the second player only who gets the musical privilege.
So, the message I want to relay is this: DIVERSIFY YOUR CHARACTER CHOICES, PEOPLE. I got so sick of hearing Ryu's and Ken's themes over and over again last night. o_O