This is a really nice article. I will be posting a more in-depth take in the next few days. Paizo announced the revision of the core rules, Bestiary, and Advanced Players Guide earlier this week. The revisions were prompted by the release of the ORC License. The goal behind the revisions is to divest the rules of any similarity to the Wizards of the Coast Dungeons & Dragons Open Game License content.
I have to say, the new cover art for these four new Pathfinder Core books looks pretty sweet.