According to the latest tidbits of information, Google will be releasing the final version of Android 7.0 'Nougat' on August 22nd. As discovered by Android Central, this is the date Canadian carrier Telus lists in the software release schedule for the Nexus 5X and Nexus 6P.
There are two factors that give credence to this rumor. Firstly, Telus accurately stated the launch date for Android 6.0 'Marshmallow' ahead of time last year. Secondly, August 22nd is also the date that an Android 7.0 preview program begins for Korean LG G5s, and presumably manufacturers wouldn't be allowed to publish any sort of update before the final code is released, even if they have access ahead of time.
So it's looking likely that Google will make an announcement on Monday regarding the release of Android 7.0, followed by the usual over-the-air rollout of the update and availability of system images for Nexus handsets.
Android Nougat has been available for Nexus devices since March in a developer preview, the final version of which was released last month. The updated operating system brings new features like split-screen multitasking, an enhanced app switching screen, an improved notification system that shows more information, and typical tweaks to performance and battery life.
The release of a new version of Android typically coincides with new Nexus handsets, although this time it seems the update will launch a few weeks before we hear anything about new smartphones. Instead, the LG V20 will be the first device to ship with Android 7.0 on board.