AP may have jumped the gun on Apple's OS X 10.10.3 release news
Apple has released several public beta updates leading up to the official rollout of OS X 10.10.3 and the new Photos app. Photos replaces iPhoto as the Mac's standard photo management app. It also replaces Apple's pro-level photo manager and editor, Aperture, but without many of the features current users want.
The AP review is more of a feature list, so don't look there for reasons to make the jump from iPhoto to Photos. The real news in their review is that OS X 10.10.3 may be dropping on us today.
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