What I imagine will happen is that if they do plan on giving us a random starter like in the B/W demo, it will be at a ridiculously high level, to the point where we can't level it up, no matter how quickly we grind in the grass. Normally these demos have a set time limit, so there's that predicament.
It would be nice to get a small insight on Fairy-type's weaknesses/strengths. I know I can wait until September for the full list, but a couple subtle hints wouldn't hurt. I made my own prediction of the type chart regarding Fairy over on another thread, so any chance I can get with matching my speculation with an affirmation would be appreciated.