Christopher Breen, writing for Macworld:
Last June, Apple announced that it would stop development of its Aperture and iPhoto apps and offer a single photo app in their place—Photos for OS X. Today, developers are getting their first glimpse of Photos, as it’s bundled with the beta version of OS X 10.10.3.
Providing many of the features found in its mobile sibling, the Yosemite-only Photos for OS X offers an interface less cluttered than iPhoto, improved navigation, simpler yet more powerful editing tools, the ability to sync all your images to iCloud (though it doesn’t require you to), and new options for creating books, cards, slideshows, calendars, and prints. I’ve had the opportunity to take an early look at Photos, and this is what I’ve found.
There are several early reviews of Photos for OS X but I found this one the most detailed and informative. Sounds like Photos will be a decent upgrade for those migrating from iPhoto but will certainly be a step down for Aperture users. It isn’t nearly as bad as I feared, nor is it anywhere near what I hoped for. Ideally some additional features – geotagging, star ratings, and stacks to name a few – will find their way into the app before it officially launches. I’d also like to hear that extensions – third-party add-ons available for the iOS version of Photos – will also be available on the Mac.