Pac-Man is having a hell of a career second act in fighting games. Of course, he is one of the free characters in Street Fighter X Tekken on the PlayStation 3. Now it looks like he'll be included—as some kind of bizarre head-thing—in Soulcalibur V's next batch of monthly costume DLC. See for yourself at 1:02 in that video.
Four years ago, Katsutoshi Sasaki, the director of Soulcalibur IV said he really wanted to see Pac-Man cameo in that game, but the problem was that Pac didn't have a weapon. I guess making him a costume option instead of a fighter solves that problem, if in a strange way.