Google has apparently pushed the Android 4.1.2 Jelly Bean update to the Nexus S and the Galaxy Nexus devices. This version of the platform, which brings in the landscape homescreen view was first pushed to the Nexus 7. Rightfully enough, it is now available over-the-air for those who owns the Nexus S and the Galaxy Nexus. If you still did not get any notification about the update, you can always check it manually. Cheers!