If you click on the link to display details about the changes, you will see a view that is similar to the All view. It displays albums/groups in the left and the thumbnails of any pictures that are going to be affected in the right.
In this example, you can see the details of the changes that are going to be made to the FotoTime account (the title bar shows that this is showing us only the Web changes at this time). This shows the details of what album is being added (the "New Pictures" album) and what pictures are being added, updated or removed. The red picture icon indicates a removal, the blue indicates an update, a green indicates an addition and a yellow indicates a refresh (re-upload).
If you want to get a better explanation of each change, you can click on a picture and a tool-tip will be displayed showing you details about that change. You can also right-click on the album and view the changes for the album.