new iPhone 4 on the counters of the U.S. Apple Store?

An envoy was worldmagazine Apple Store this morning in Tampa, USA, and noticed something unusual ...

The staff at the store, in fact, have replaced many of these iPhone 4 with other devices on the counters.

These four iPhone just put on the counter with the edge aluminum duller and less polished than the previous, as confirmed by other users these days are made to replace the device and would think that Apple is using some kind of insulating material for limiting the reception problem.
 put the iPhone 4 on the counter were all free view box and Aprima seemed already used or new but not from "out of the box.
In the afternoon we decided after news also by the Apple Store in New York and discover something more.
We will keep you updated.