User blog comment:Phantom R/It's like a Puzzle... all other character promos./@comment-76.15.25.240-20110602230641

My theory is that they don't want to reveal every single alternate character. I mean them showing the alternate versions of Phineas, Ferb, Candace, Perry, and Doofenshmirtz is one thing but they probably want to keep the alternate versions of other characters like isabella a secret until the movie airs.