Developers have been able to try out the beta version of OS X 10.10.3, and as of Monday the public can, too. Mac users who signed up to participate in the public beta program can download the latest prerelease build of the upcoming Mac OS update, and it includes a beta version of the iPhoto replacement app Photos, too.
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Don't forget beta means "not ready to ship," so there may be bugs and other surprises that cause app crashes and data loss. If you're planning on playing with the beta consider installing in on a Mac that isn't critical for your daily work.