The release of Android 4.1.2 to AOSP was announced by Jean-Baptiste Queru, (Technical Lead, Android Open Source Project, Google) today via Android Building Group. This will just be an incremental update over Android 4.1.1, as stated by the update notification "improves performance and stability and fixes bugs." Nexus 7 tablets will be the first to receive these updatess.
Changes noticed till now:
• Launcher landscape mode available on Nexus 7
• Issue where Jelly Bean failed to connect to WPA enterprise wireless is fixed
The update is 31.3MB in size with a build number JZO54K while the AOSP tags are android-4.1.2_r1 and jb-mr0-release. The announcement also adds that the future versions of the grouper hardware will have change in power management chip, therefore will not support Android 4.1.1
The official release statement by Jean-Baptiste Queru:
We're releasing Android 4.1.2 to AOSP today, which is a minor update
on top of 4.1.1.
As a note to maintainers of community builds running on Nexus 7:
please update to 4.1.2 at the first opportunity. Future variants of
the grouper hardware will have a minor change in one of the components
(the power management chip) that will not be compatible with 4.1.1.
The build number is JZO54K, and the tag is android-4.1.2_r1.
Conley and JBQ
Jean-Baptiste M. "JBQ" Queru
Technical Lead, Android Open Source Project, Google.