When do GAC Feats renew?

Wondering if there is a fixed time schedule of the feats we will receive, or if we finish the feats earlier, do we get more feats? Do the feats always renew when the attack phase start or setup phase start?

Also I got "You have something I want feat", which require me to use 2 imperial remnant characters. I couldn't see this feat on newsletter. So is newsletter not exactly showing all the feats?

Couldn't find definite answers for these questions on forum. Would appreciate if someone clarify this.