The update size is around 95MB and it will take your phone from Android 4.1.1 to Android 4.2.1. You can manually check for the update by going to Settings >> About Phone >> System Updates >> Check now.
As updates for yakjuxw variant are pushed by Samsung, they are often late by months, thus when takju and yakju variants were updated months ago, yakjuxw variant is now getting this update and still is due to get Android 4.2.2 update.
In related news, US telecom operator, which sells an LTE version of Galaxy Nexus also started pushing Android 4.2.2 update for the phone after weeks of delay. The Verizon version of Galaxy Nexus is also getting the update OTA.
Thanks Amarr Sawllani