Board Thread:Speculation House/@comment-24278127-20131211040442/@comment-3146930-20131211060839

If I remember correctly, it was mentioned by Monty that everyone has a unique Semblance. This could mean that everyone in the main cast has a different Semblance and not everyone in the entire RWBY World. I mean there are only so many powers out there before they start over-lapping with someone else's. As far as characters with a Semblance, only about a handful have been defined at this point in the series. We have three Glyph users, Ruby, Blake, Yang, Pyrrha, and a small hint about Jaune's in the commentary, but nothing concrete. Also keep in mind that even if we know what a character's Semblance is, they could find new ways to use it. Once again going back to the Flash, he has super-speed which on paper doesn't sound that impressive. However he can use it to make tornadoes, create a vortex, travel in time, and vibrate through solid objects.

Also just as a side note that might make you happy, Monty I think did mention plans of an episode(s) explaining the relationship between Dust, Aura, and Semblance.