Today Google has made available the last Developer Preview release of Android 7.0 Nougat. The new OS version is almost ready for prime time now, and after this we'll see the finalized bits rolling out to supported Nexus devices in a few weeks. The last Nougat preview brings with it bug fixes across the board, as you'd expect. Developers are told that this release gives them "the near-final system updates for all of the supported preview devices". So testing apps against this iteration will help them get their software ready for consumers. The final N APIs are shipping in this Developer...
Source: http://www.gsmarena.com/final_android_70_nougat_developer_preview_is_now_available-news-19470.php