Developers can download the new beta, build 14E11f, through the Software Update mechanism in the Mac App Store or through the Mac Developer Center.
OS X 10.10.3 introduced several consumer-facing changes including the new Photos for OS X app, a redesigned emoji picker, new diversified emoji, and more, but OS X 10.10.4 appears to be an under-the-hood update that brings performance enhancements and bug fixes.
The First two updates to OS X Yosemite, OS X 10.10.1 and OS X 10.10.2 were also mi**r behind-the-scenes updates that improved performance through bug fixes and enhancements.
04-28-2015, 12:53 AM
Apple Seeds Second OS X 10.10.4 Yosemite Beta to Developers, First Public Beta Versio
Apple today seeded the Second Beta of OS X 10.10.4 to Developers, approximately a week and a half since releasing the first 10.10.4 beta and nearly three weeks after releasing OS X 10.10.3 with the Photos for OS X app to the public. Alongside the new developer beta, Apple also released the First Public Beta version of OS X 10.10.4. 
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