PathfinderOnline is described as a sandbox MMO, where players explore a high-fantasy frontier where they can be basically whatever they want to be, and can forge their own kingdoms if they want to.
Goblinworks and Paizo are adopting a subscriber model for PathfinderOnline, in a time when that revenue model is quickly losing ground and even behemoths like Star Wars: The Old Republic have been forced to adopt a F2P model.