Apple releases new public, developer beta of OS X 10.10.3

Developers can get this latest build from the Apple Developer Center. AppleSeed testers can grab the update from the Mac App Store Updates section.

OS X 10.10.3 contains the much-anticipated Photos for Mac. Photos for Mac, which will replace both iPhoto and Apple's pro-centered photo app Aperture, lets users view, edit, and sort their photos, and has support for iCloud Photo Library built right in. Additionally, the update contains a number of stability and security improvements.

Source: Apple Developer Center