Thursday, Apple seeded the first beta of the upcoming OS X Yosemite 10.10.4 software update to its Mac developers, as first reported by MacRumors. Registered Mac developers can grab the installer manually through Apple's portal for developers, or automatically, using the OS X Software Update Seed Configuration Utility.
We'll be reporting on any interesting new features, changes and enhancements in OS X Yosemite 10.10.4 beta 1 as we encounter them.