Apple has seeded the fourth beta of OS X 10.10.4 to developers and public beta testers. The new beta comes just over two weeks after the third beta.
The fourth beta, build 14E26a, can be downloaded via the “Update” tab of the Mac App Store, or via download from the Mac Developer Center.
Apple has asked beta testers to focus on Photos, Migration, and support for Arabic and Hebrew languages when using this build.
While 10.10.3 brought the new Photos for OS X app, along with a redesigned emoji picker and a number of diversified new emoji, so far OS X 10.10.4 looks to be a relatively quiet update, features-wise, instead concentrating on performance enhancements and bug fixes.