The latest production LG Nexus 4 turns getting design changes slightly when compared to the previous Nexus 4.
The change was first recognized by Android Central. At Nexus 4 recently added two small dots on the back of the phone which serves as a booster for the speakers that sounded clearer when placed on the table.
Besides this little wedge serves to give the distance to the body of the Nexus 4 in order to avoid scratches when placed on the table. In addition there is also a change in the lens and the camera becomes smaller ring.