Google’s Technical Lead for the Android Open Source Project (AOSP), Jean-Baptiste M. Queru (JBQ), announced a short while ago via Google Groups that Android 4.1 is being released to AOSP. According to JBQ, it is available with the name “android-4.1.1_r1” on the jb-dev development branch.
JBQ recommends the creation of new clients to improve sync speed and produce smaller clients. He also indicates in his post that proprietary binaries are ready for the Nexus 7 and Galaxy Nexus. Binaries for the Galaxy S and Xoom are expected to follow shortly and coincide with the timing of their consumer release.
source: Google Groups