Hmm. Didn't think about that, but it does make sense. I mean in the original, you played as pacman, so you always know if you have the powerup or not, ghosts be damned! But in this case, there should be an indicator.
EDIT: Actually, thinking more about it, doesn't the ghosts turning blue indication enough? I mean, doesn't even matter if he has the powerup, if you're not blue, you can get him (e.g. if you've already been captured).