Nope! You guess the classes right, and they're actually pretty much just subsets of the ones that are currently out there. We stuck to the moves that we were the surest in. In fact, all the starting moves are the same (except when they referenced something that's not in the preview, like groups).
As far as the rules go, the preview edition has only minor changes. A few rewordings and such, mostly for clarity.
The main difference is in how the GMing section is presented and the included adventure.