There’s no word on who it was, but someone let slip a bunch of new characters from Soulcalibur V, who were going to be revealed at Comic-Con. Namco were supposed to make the new character announcements as part of some kind of exclusivity deal, but the cat’s out of the bag now.
Dedicated Soulcalibur community, 8WayRun, has the scoop. Included in the leak are Ivy, screenshots of Taki’s recently-revealed disciple — named Natsu — and a new character named Zwei (he was the second silhouette). You can find more screens at 8WayRun.