Moto X Body Construction & LTE
Moto X features a laminated aluminum structure for a light weight and high strength design.
Moto X features Dual LTE MIMO Smart Antennas, which should deliver the best 4G LTE performance (faster data speeds and better reception). Most OEMs support 4G technologies on the same antenna as 2G/3G, but Moto will have 2 antennas dedicated to 4G LTE. There will be 5 antennas inside Moto X: 4G main, 4G diversity, 2G/3G main, GPS, and BT/WiFi
Moto X features something called Moto Magic Glass. This is a single sheet of Gorilla Glass which is molded to a special polymer to make a continuous surface that wraps around the entire front and edges of the device. There is zero gap with the back.
Source: Taylor Wimberly (https://plus.google.com/110694450299661318989/posts)