After a two-week holiday break with no releases, registered members of Apple's developer program can now access the third pre-release beta builds of all four of the company's major platforms.
Given that the updates are "sub-point" releases, it is unlikely that major new features are coming to the updates. Apple usually keeps small version increments limited to bug fixes and small tweaks.
The release notes remain sparse, and contain no declared foci for testing. The build numbers for the releases themselves have about the same increment in digits between the second and third releases as there was between the first and second, suggesting release is not imminent.
The new versions are all available to download through Apple's developer portal. Public beta builds should be forthcoming as well.