This is exactly what I was just thinking about. Maybe the 4th DLC character won't even be decided by them; it'll be decided by us fans. Maybe after the DLC is released and (almost certainly) sells well enough, they'll hold some kind of contest of some sort to see who is the most requested DLC character, and whichever character gets the most requests/tweets/fan/tags/etc. will be the character that becomes DLC.How long do you think it would take them to create a character and test their move-set for balance? Is it possible that they haven't decided who it'll be yet?
I would have gone with this if it weren't for that damn "Fujin" announcer file that was leaked.