Many would call the HSPA+ Galaxy Nexus the only true Nexus of its era. Still, Google is willing to treat the CDMA versions as equals, and it just posted factory images with the latest available Jelly Bean builds for those devices. Anyone with a Verizon model can now flash with Android 4.2.2 if their existing OS install ever goes awry; Sprint users aren't quite on an equal plane, but do get a 4.2.1 image to work from. Relevant driver binaries are also available. Whether you're a custom ROM creator looking for a starting point or just want a fallback for any risky experiments, the relevant source links should have what you need.