Inno said it would be once a month for FA and I believe they are starting to do that now. That extra one we had late May seemed to be a tester for which version worked better but I think they still need some improvements before people will jump on board with 12 FA's per year. Inno, we really really really need a quest system improvement before we get much further with this....
I proposed a better quest system a while ago somewhere in the forum, I hope you have read that to get your creative juices flowing.