Both Brazil's Adrenaline and Malaysia's Lowyat.net claim to have seen newly shipping Nexus 4s with an as yet unannounced Android 4.2.2. From Engadget:

What's new in the extra 0.0.1's worth of code isn't immediately evident, although the update (if real) isn't known to be rolling out as a separate upgrade for existing devices. We've reached out to Google for comment; let us know if you see any 4.2.2-based surprises in the interim.

Android 4.2.2 supposedly shipping with new Nexus 4 units in Brazil and Malaysia