the PINs usually have less exclusions than the GP FD dates. I think there are more dates than the GP offer. Last year I called the night I saw all the posts that people had gotten Fall FD PINs; after checking my e-mail over and over. Decided to call, no PIN for me but asked the CM to check under my sisters name (we went together) and she had the PIN even though she never got the e-mail so I don't have anything to check for the dates. We were able to get FD for October at POFQ last fall by using the PIN. POFQ was excluded from GP offer.
With the Fall dates releasing so much earlier than last year, no way to know what the PINs will cover or if there will be any.
If you see posts about PINs it never hurts to call and ask the CM to check the name of every person in your party.