Googler Jean-Baptiste Queru has just announced the push of Android 4.0.3 to the Android Open Source Project tree.  This build is for the Motorola Xoom (U.S. Versions), the Nexus S (all versions), and of course the mysid and yakju builds of the Samsung Galaxy Nexus.  Yes, one set of sources and build number for several different devices -- that's a first for AOSP and if it's pulled off well (I'll bet it is, these fellows know their schtuff) it's a big leap in Android development.  As JBQ mentions, this is the first time AOSP works for a tablet, the first time it works on a device that's neither a Nexus or an Android Developer Phone, and the first time it works for devices on Verizon.  Mr. Queru also has this to say:

Over the years, I've released 50 different versions of Android in AOSP, not counting the SDK and CTS, and I think that this is the best release ever.

Those are the kinds of words we all love to hear.  Wait for the announcement that it's ready for syncing, then prepare yourselves -- this is going to be one helluva ride. 

Source: Android Building