As expected, Google just posted the factory images and binaries for Android 4.2.1 (JOP40D) for the family of Nexus devices. For the Nexus 10, the factory image is still at JOP40C due to an issue. These files allow you to restore any of these Nexus devices to stock if you ever get into trouble, so download them now and keep them in a safe place. Links are below for both the factory images and the binaries.
