Yesterday, Android maintainer JBQ posted up a number of binaries and Android 4.1.2 images for multiple Nexus devices. Owners of international GSM variants of the Galaxy Nexus, though, were left out on the image side. Today, both the "soju" (Nexus S) and "yakju" (Galaxy Nexus GSM) have had their factory images updated to Android 4.1.2, and you can find those images here.
Google also saw fit to finally release a factory image for the Nexus Q, though it's based on Android 4.0.4. A number of driver binaries were added today as well, specifically NFC drivers for the Nexus 7, GSM unlocked Galaxy Nexus (maguro), and both the Sprint and Verizon Galaxy Nexus. These drivers allow those devices to have the same "enhanced NFC behavior" of the Nexus S - whatever that means.
You can find all of this stuff on the Google Developers site, at the source links below. You can also check out JBQ's post on the matter on the Android Building group, here.