Looks like the Nexus 4 got a little plastic surgery done to it, according to recent reports. New Nexus 4 phones that have been shipped out recently, have very minor design tweaks, one being needed, the other not so much. First tweak is added little nipples on the back of the phone. Do not get too excited there gents, this just helps out the speaker on the back of the phone not get muffled once lying flat on its back. These little nipples that were added, add a little buffer zone between the phone and the surface it lies on. It is the little things that we love. In this case it is little nipples.
The camera lens always got a minor little tweak as well. We are not really sure what kind of improvement this lens tweak actually does, but hopefully it fulfills some kind of purpose to the user. MobiFlip says it has to do with aesthetics. You take your guess now. Let us know if you just recently ordered a Nexus 4, and have seen these design tweaks.
Source: Android Police