Oh, you remember Google had removed December in the People app in the 4.2 update? They promised to fix it, and sure they have. The Android 4.2.1 update is now rolling out for both the Takju and Yakju variants of the Galaxy Nexus, and it’s a small update, worth about an MB, approximately.
That is all the update fixes, on the user-front. If you’re still on 4.2, you might want to check for updates. I’m on a CyanogenMod10 nightly, so I can’t, for now.