Capcom let the Evo organizers decide on letting Ibuki be played.
They then let the people vote on it.
I don't think anyone has gotten any substantial time with her or Balrog, especially any lab time. And I've been told by a friend who is big into the FGC and has participated in several major tournaments over the years that people clown their way all the time out of pools. They do anything (gimmicks, cheap/abusive tech) to get out of pools until they hit the point where that stuff doesn't work anymore.
I honestly think there wont be an Ibuki in top 32 (Maybe Balrog ala PR Rog), but there is always a chance for possible upsets; it is Evo after all.