It's been just over two weeks since Apple released the second developer betas for its next major updates, and that means that it's time for new builds. The third developer betas for iOS 13, iPadOS 13, watchOS 6, tvOS 13, and macOS 10.15 Catalina are now available.
As usual, there are a bunch of fixes; however, there are some new known issues. This build of iOS 13 is not available for the iPhone 7 or 7 Plus, which means that if you're running the beta on those devices, you'll be stuck with beta 2 for another two weeks or so.
Apple is still pretty early on in the beta cycle, so there are still a lot of issues, and they're getting fixed pretty quickly. In fact, this is enough of an improvement on beta 2 that Apple has removed its notice for "thrill seekers" from the Apple Developer download page.
All of the updates can now be obtained by using a configuration profile, which is available from Apple Developer. If you're already running the beta, you should be able to check for updates normally.