I don't know about PS4 Pro price drop announcements, the PS4 Pro Destiny 2 bundle comes out September 6 for $449.99 and a Playstation agent on chat told me a PS4 Pro GT Sport bundle is coming October 17 which I assume would be $449.99, too, because why would Sony offer a cheaper Bundle?
Maybe a less expensive, slimmer, higher performance Pro will be out for the holidays. Hope so. Sony should announce something for Pro September 19 to compete with Xbox1X.