Alongside the release of OS X 10.11.4 Beta 2, Apple has also launched OS X Server 5.1 Beta 2. Similar to the previous OS X 10.11.4 Beta 1, the second build of OS X 10.11.4 Beta is also a minor update featuring bug fixes, security improvements, as well as performance enhancements.
OS X 10.11.4 Beta 2 is now available through Software Update or via the Mac Dev Center for registered developers.