The update makes several enhancements, most notably fixing an issue causing the camera to take blurry photos in well-lit settings
Users will also see improved battery life efficiency and a quicker start-up sequence, along with more reliable Bluetooth connectivity and "enhancements in messaging" that include the option to decline calls via SMS.
One update at a time
When the update does arrive it will bring many WP8 features to the older-gen Lumias, at least cosmetically, including a more customizable Live Tile layout.
In the meantime though, AT&T and Rogers subscribers can enjoy taking clearer pictures and more efficient battery with today's over the air update.