Note that not all users will be getting the OTA update right away, so it might take some time for you to get the notification. Once you apply the update you can expect new navigation, revamped UI, new split-screen look and re-designed Quick Settings. Supposedly, the battery life should be extended even further as well.
The changelog mentions improved camera performance - new panorama feature and better low-light performance. Dual SIM Dual VoLTE support is now at hand too.