A few other changes were mention with the change-log, which are portrait mode support, improved performance & picture taking experience, and some usual bug fixes. Meanwhile, reportedly, several other changes are included as well, such as support for RAW file capture, Google Now and Google Assistant built-in to ZenUI launcher, and customizable Quick Settings. The update also removes some third-party apps.
To update your phone, go to your phone Settings>> About phone>> System Updates, there you should see the update.
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