Apple is now on its fourth round of betas, providing developers with new builds of iOS 13.2, iPadOS 13.2, and tvOS 13.2 for testing alongside the fifth beta for watchOS 6.1.
The newest builds can be downloaded via the Apple Developer Center for those enrolled into the test program, or via an over-the-air update on devices running the beta software. Public betas typically arrive within a few days of the developer versions, via the Apple Beta Software Program website.
Apple seeded the third round of betas for iOS 13.2, iPadOS 13.2, and tvOS 13.2 on October 16 at the same time as the fourth watchOS 6.1 beta. The second iOS, iPadOS, and tvOS builds, along with the third for watchOS, arrived on October 10, though that release was pulled for some models of iPad Pro due to reports of bricked devices following its installation.
So far, the betas for iOS and iPadOS have included a few major changes, such as the option to opt in to a program to supply anonymized voice recordings of Siri requests for accuracy review, new emoji, camera app changes, and the ability to delete apps via the Home Screen's 3D Touch or Haptic Touch contextual menu. References to noise cancellation in a future model of AirPods have also been discovered in the betas.
AppleInsider, and Apple itself, strongly recommend users don't install the betas on primary devices or hardware they consider to be "mission-critical" at all, as there is the highly remote possibility of data loss or other issues. Testers should instead install betas onto secondary or non-essential devices as a safer alternative, and to always make sure there are sufficient backups of important data before updating.
Update: Public betas now available.