These are only available for Nexus 7 and Galaxy Nexus
Google introduced yesterday the latest version of its mobile operating system, Android 4.1.2 Jelly Bean. The new update is already pushed through all Nexus 7 models across the globe and some Galaxy Nexus devices.There's a number of changes that are said to slightly improve the Nexus 7 hardware, but also some software enhancements that promise more stability and performance.
The new release for AOSP (Android Open Source Project) also includes landscape support for stock launcher, but no other changes have been officially confirmed.
However, some of the improvements included in this major update have been extracted from git logs and are available here.
Expect Android 4.1.2 Jelly Bean to bring consistent improvements for the Search ability: fix history navigation functionality; faster ajax requery while typing; ignore ENTER key when performing requery to avoid reload; improve results reveal with minimum height for proper div.
Android 4.1.2 Jelly Bean is expected to be rolled out globally to most Nexus device in the coming months, though Google only released factory images for Nexus 7 and Galaxy Nexus for the moment.
So far, only the GSM/HSPA+ Galaxy Nexus (with Google Wallet) got an Android 4.1.2 Jelly Bean factory image (takju), but we can safely assume that Verizon's variant will be uploaded on Google's servers as well. A “nakasi” Android 4.1.2 Jelly Bean factory image is available for Nexus 7 tablets as well.
According to Google, “these files are for use only on your personal Nexus devices and may not be disassembled, decompiled, reverse engineered, modified or redistributed by you or used in any way except as specifically set forth in the license terms that came with your device.”
The recently released Android 4.1.2 Jelly Bean factory images for Nexus 7 and Galaxy Nexus devices are now available for download here. Stay tuned for more updates on the matter.