Themetricsystem I am very glad to see you actually state that despite being a Hybrid class Shaman is unique enough to warrant a class. Its one of my favorite classes, and most definitely feels distinct enough from its parent classes and the core classes to stand on its own, at least imho.
In my opinion some other classes I would Love to see along the line are Shifter with a Proper Implementation this time, Slayer, Hunter, Kineticist, and Occultist. Though I'm sure there will more than likely be an Occult Adventures book somewhere down the line for Occultist and other classes, like the Psychic.
Vigilante I say why split it up? There's a number of great options in the Vigilante Talents & the Social Talents that's more than just skill feats... Though covering it in an archetype or a few could be an idea...