As well as releasing the new iOS 8.4.1 beta, Apple has also released OS X 10.10.5 Yosemite beta for developers.
The release of OS X 10.10.5 Yosemite beta comes two weeks after the release of OS X Yosemite 10.10.4 which also brought a new iTunes and Apple Music to OS X.
The new OS X Yosemite 10.10.5 comes with a range of security, performance, and compatibility improvements, there are no details on exactly what the new features includes in the latest Yosemite beta are.
OS X 10.10.5 could be one of the last updates for OS X Yosemite as Apple are releasing OS X El Capitan which is expected some time this fall.
Source Redmond Pie