Thanks alot guys...
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Henaki on the Shoryuken.com message boards mentioned he heard through a friend of a friend of a friend that the 10 new characters for Street Fighter IV Dash (Champion Edition) are:
From Street Fighter 2: Dee Jay and T. Hawk.
From Street Fighter 3: Dudley, Ibuki and Makoto.
From Street Fighter Alpha: Adon, Cody and Guy.
Plus two completely NEW characters.
He claimed this information would be revealed at, or right around the time the Tokyo Game Show takes place (Sept. 24 - 27).
Now, pretty much anyone could jump on the forums and claim these characters will be in the game, but Henaki has a solid reputation and a ways after his post was made the thread was deleted. Normally, threads are locked for stuff like this, but the current post was up to 4 or 5 pages before it was zapped.
Regardless, it will be difficult to know the facts until more is confirmed from Capcom or another source, but we know from the official Japanese Street Fighter 4 blog that something is coming soon.
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Over at the Japanese SFIV blog, Shiozawa-san recently shared some of concept sketches for the SFIV alt. costumes. In addition to the art, she explains that the motivation behind the alt costumes was that they be outfits the characters would actually wear in the course of their individual pursuits.
So for instance, Blanka is adventuring through the jungle, Cammy has a "cold weather operation" suit (although I'd suggest, I dunno, pants?), and Dan has a special training outfit for all the extra time he spends practicing to actually win a match.