This is release 4.9.0-beta2 (beta1 was not released, due to a tagging mistake) of the Authoritative Server. It brings a few new features, and a collection of small improvements and fixes. Some internals have been reworked to support the new features. A detailed list of changes can be found in the changelog.
Please make sure to read the Upgrade Notes before upgrading.
If you install (not upgrade to) this version on Debian or Ubuntu, please read this ticket about broken configs first.
The tarball (signature) is available at downloads.powerdns.com. Packages for various distributions are available from repo.powerdns.com.
Please send us all feedback and issues you might have via the mailing list, or in case of a bug, via GitHub.