In a lengthy and detailed blog post, Goblinworks' Ryan Dancey explained what the GW team considers to be Pathfinder Online's "minimum viable product." He also explained that early enrollment users will first gain access to what is effectively a barebones version of the game, with the focus from the team being on building a strong foundation for the content to come. Development will continue in phases from there.
Most important for backers is the announcement of a timeline; early enrollment for Pathfinder Online is currently set for the third quarter of 2014 and is expected to run for around 18 months. With that schedule, unrestricted territorial warfare would launch in the first quarter of 2016. Goblinworks is billing the long development pipeline as an opportunity for players to get in on the ground floor and witness MMO development from the inside out.
[Thanks to Chrysillis for the tip!]