A new Pathfinder playtest has started. It has 3 alternate classes from the Ultimate Combat book due out in August. The classes include Gunslinger, Ninja and Samurai. These are alternate classes for two core classes and a base class. Gunslinger is an alternate fighter. Ninja is an alternate rogue. Samurai is an alternate cavalier. If you take levels in the original class you may not take levels in the alternate class and vice versa. I would note them as Fighter (Gunslinger), Rogue (Ninja) and Calvelier (Samurai). These seem very similar to archetypes but appear to be more comprehensive.
The playtest PDF can be found at: http://paizo.com/pathfinderRPG/v5748btpy8igw
I have also added a link to the new content on my D&D/Pathfinder page: https://sites.google.com/site/zombiehomepage/Home/zombie-s-d-d-pathfinder-page
The new playtest classes are now legal for PFS games.
Complete listing of what is legal for play can be found at: http://paizo.com/pathfinderSociety/resources.