The first round of security updates for Nougat is ready. It has only been eleven days since the official release of Android 7.0, but keeping with the regular schedule, new factory images and full system OTAs are now available for installation. There are also Marshmallow-based images with the latest security updates for many devices, including the Nexus 5, which will no longer officially receive major version updates. (Note: it looks like the OTA page lists the new updates, but the files aren't linked properly. Just keep checking back.)
Strangely, Android 7.0 images are still not available for the Nexus 6P, Nexus 6, and Nexus 9 LTE.
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