this is not surprising to me as I have been using iPadOS 13.1 beta 2 and there are still bugs. Springboard crash, keyboard navigation defects, etc. They bit off a lot with this iPadOS release so the 10ish day delay while uncharacteristic for Apple is understandable. I will gladly take a delay for all the new features coming to iPad. I've been using the Beta since day 1 and it is a huge leap towards productivity parity with MacBook. Mouse support, full Safari browser, file downloads, USB storage, today screen pinned widgets really make a big difference.