The previous update, JWR66V, brought Android 4.3 to the phone. If your Google Nexus 4 is not running yet on the latest Android OS build, you are one update behind.
There is some speculation that the other Nexus devices and the Google Play editions will also be receiving the very same security fix. And sure, no one gets to play around with new features after an update like this. A maintenance update is boring. But perhaps you'll sleep better knowing that your Nexus 4 is better protected against the evil that permeates the world today.
source: T-Mobile via AndroidCentral