The photo manager update was introduced on July 24, 2012. If you want to get the nitty-gritty about ALL the photo manager updates and changes, follow this link which will direct you to a more detailed article and tutorial within the new HM Support website.
My favorite new photo management feature is the “photo details” box that opens when you double click on a photo. Here, you can easily scroll through photos in an album and see a detailed view of each one. You can add and change photo filenames and captions, see photo dimensions, file sizes, when a photo was uploaded, and best of all, photo usage!