The update weighs 1.21GB in size. It includes all the goodies of Android 7.0 nougat. For example: New Multi-window allows the user to switch between apps with a double tap or run two apps side by side. More personalized settings and smarter notifications allow users to be more productive with less effort. It also includes the enhanced version of Doze. Along with all these features the update is also packed with the latest security patch.
The update is rolled out over the air, so it might take some time to reach you. Don’t panic if the notification is not reached you. You can check it manually by through the Setting>>About Phone>> Software Update. Users who got the update can share there experiences via comments below.