OS X 10.10.3 Public Beta with Photos App Now Available
Apple has released the first public beta version of OS X Yosemite 10.10.3 with the new Photos app. The beta software is build 14D87p, nearly the same as the most 2nd developer beta, and can be installed by users who are opting to participate in the OS X Yosemite Public Beta testing program.
It is strongly advised to back up your Mac with Time Machine before any beta version of OS X, let alone a beta version of photo management software. Absolutely back up your photos before using the beta Photos app.
The new Photos app for Mac is similar to Photos for iOS, and relies heavily on iCloud Photo Library. The app aims to replace iPhoto.
Aside from the new Photos app, there are some other minor changes that are known to arrive in the existing OS X 10.10.3 beta versions as well, including new Emoji character icons and support for Google two-factor authentication. The release notes focus mostly on Photos app, but do mention the update aims to improve the stability, compatibility, and security of Macs as well. No specific bugs are mentioned.
OS X 10.10.3 Public Beta can be found in the Mac App Store through the “Updates” tab, the Photos app is included in the same download.
If you were participating in the Mac beta program but opted out of the Public Beta updates, you can reverse that change, refresh the App Store, and find the update available.