Today Apple releases the OS X 10.10.5 beta 2 to the developers, two weeks after releasing its first beta version and one month after releasing OS X 10.10.4 public release. Probably this is the last update to the OS X 10.10.5 as we are only two month away from OS X 10.11. EI Capitan.
This beta, build number 14F19a, can be downloaded through the Software Update mechanism in the Mac App Store or through the Apple Developer Center. The previous beta version of OS X 10.10.5 beta did not appear to include any consumer-facing changes, so it’s likely that this update focuses on behind-the-scenes bug fixes and performance enhancements.
Till now OS X Yosemite received updates, the first two brought bug fixes and security improvements, while OS X 10.10.3 the most significant update to Yosemite, introduced the news photos app, Force Touch, APIs, new emoji features and more.
OS X 10.10.4, the current version of Yosemite, also focused on bug fixes and stability improvements, most notably introducing TRIM support for third-party SSDs and eliminating the Discovered process that caused ongoing connectivity issues in the OS.