Let me cut through the marketing-speak:
They have discovered a conductive material with such a low velocity factor that they can use less of it, and therefore lower the Q of their RF conductors to the point that the already hidden, internal antennas will be slightly more internal and hidden. Oh, and did we mention, less efficient? They figure there are enough cell sites saturating the urban areas that ghetto saps will not notice. Those of us in rural areas certainly will.
I long for the analog phone days when I had a 3-watt phone under the seat and an antenna on the roof of the truck. Man, that thing sounded great. People sounded like people, not like robots with severe packet loss.