It looks like the Google Nexus 4 wont be the only device to receive the new JWR66Y security update. Other members of the Nexus family like the Google Nexus 7, Google Nexus 10 and Google Galaxy Nexus are also expected to receive this new software which is around 2MB in size and updates your software to version JWR66Y from JWR66V.Users who have the Galaxy Nexus yakju models have conformed that they are receiving the update. If you own one of these devices you can download and install the update courtesy of the XDA forum where the update.zip file is available for manual flashing. There are also unconfirmed reports that the update is pushing out to the Nexus 7 and Nexus 10.
Other than the fact that the JWR66Y update brings security improvements, there are no details on exact enhancements we can expect. If you come across the update and identy any new features on your Nexus device please leave us a comment with a screenshot below.
source - XDA | PhoneArena