As promised, today Google is releasing the Android 4.1 source code into the Android Open Source Project (AOSP) for everybody to download, examine, and likely attempt to port a a whole host of devices. Writing in the Android Building group, Google's Jean-Baptiste Queru notes that the company has also released "proprietary binaries" for the Nexus 7 and the Galaxy Nexus, and that "Nexus S and Xoom will follow." That doesn't mean that full ROMs for those devices are official yet, but it's a good indication that they're close.
There's still no word on when users can expect proper factory images for any of the above devices, but they should come after the OTA updates begin rolling out. In the meantime, we're sure that Android developers everywhere will have a fun filled evening in front of them, and we'll be interested in hearing if the team over at CyanogenMod find that Android 4.1.1_r1 matches up with their earlier expectations.