Apple recently released a fifth beta of OS X Yosemite 10.10.2 to developers, and the focus this time was still on Mail, Bluetooth, Wi-Fi, and VoiceOver issues. The fifth beta has build number 14C106a and the Cupertino-based company notified developers that once the update installs, it canít be reverted back. So be sure that you absolutely want to test out the new beta before installing it.

Many users back in October complained about Wi-Fi issues when they updated to OS X Yosemite. Some of the issues included connections that would be dropped, poor connections, and even timeout connection periods. Hopefully, the developers can find a fix to this underlying issue.

As for Mail, a lot of the previous maintenance updates have already cleared the problems but it has been said that there are still some minor issues. Apple did not mention the problems that existed for VoiceOver or Bluetooth, so that still remains unclear. Developers can find the fifth beta of OS X Yosemite 10.10.2 from the Mac App Store or from the developer portal.

Source: Apple