I doubt it as well. They have released PB a few years ago with far too many bugs, even when the GPS was broken.Gurman and co. said that they‘ll do PB with DB3 due to „bugs & stability issues“. Seems far fetched cause the beta seems pretty stable already.
But what frustrates me is people keep saying things pretending they are experienced in the beta process and they keep saying that usually PB3 comes after DP2, which was never the case.