The update adds a dedicated “sharing” tab to the bottom of the app and several different ways to share photos. For one, the app will now suggest photos for you to share and who you might want to share them with. The feature is largely based around facial recognition: if Google realizes you regularly share photos of a specific person with a specific email address, it will offer to send them any new pictures.
Using the feature, a parent could, for instance, have Photos automatically send their spouse any pictures taken of their children.
Google says the new features are being rolled out “this week.”