When Paizo was planning this year's Pathfinder Playtest, we expected to exceed our own ability to fulfill orders on a timely basis, so we decided to use Fulfillment by Amazon. Unfortunately, Amazon's reports indicate that most customers will not be receiving their orders by tomorrow's release date. They shipped 3 orders on July 28, 3 more on July 29, and no orders on July 30 or 31. Today, they have shipped almost 10% of the outstanding orders, and they are continuing to ship through the night and into tomorrow. They have so far been unable to tell us when they will complete shipping. We will be posting updates as we receive them in this forum thread.
This delay doesn't impact preorders placed with retailers; most of them should have already received their products for release tomorrow. Paizo.com preorders for pickup at Gen Con are also unaffected.
We sincerely apologize for this delay. If your paizo.com Pathfinder Playtest preorder is being fulfilled by Amazon, we will be giving you $15 in paizo.com store credit in the near future.
PDFs of all of the playtest products will be available for free shortly after 6:00 AM Pacific time at paizo.com/pathfinderplaytest.
—The Paizo Team