When OS X El Capitan releases for public consumption in the fall, it will deliver, among other features, an update to the built-in Photos for Mac application.
As a matter of fact, El Capitan marks the first major feature-packed update to Apple's photo-management solution since Photos for Mac debuted as part of April's OS X Yosemite 10.10.3 software update.
As mentioned in the official El Capitan release notes distilled into human-readable form by Jason Snell of Six Colors, Photos 1.1 brings out about half a dozen new features that didn't make it into the initial release, on top of a bunch of bug fixes, security improvements and optimized performance.