We received tips from a number of folks this morning that the Nexus 4 has finally had its source code dropped into AOSP - and it has! Sort of. If you head over to the Android Git, and to the /lge/mako repo, you'll notice lots of things that people with beards understand. And those things are, basically, the source code for the Nexus 4 (which is still called mako in AOSP, apparently).
While Android 4.2 is now making its way into AOSP (Android Open Source Project), support for one device in that code is not, and won't be for some time: the Nexus 4. Android maintainer JBQ (an awesome guy we quote a lot on days like this) has confirmed that the "Nexus 4 is not supported in AOSP at the moment: no source files, no binaries."
JBQ is not able to comment on why this is the case, or when we might expect the Nexus 4 to join Google's big happy AOSP Nexus device family, though obviously if Google could merge it into AOSP today, they would.