A new leak just popped up recently with intel on the Moto X. This one includes a nice screenshot of the device and confirms some previously rumored specs. As it turns out the Moto X will indeed include a dual LTE MIMO Antenna. In fact, the device will include five total antennas: 4G main, 4G diversity, 2G/3G main, GPS, and BT/WiFi. Here's a quote from the source of the leak,
This is pretty exciting news to say the least. It looks like Motorola is focusing on things that are really important in a mobile device instead of constantly racing to cram the most powerful guts in their device.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.
Thanks for the tip, "CK"! You can see the original post on this story over at MotoXForums.com: More Features Leaked for Moto X: Dual LTE MIMO Antenna Confirmed
Source: Google+ - Taylor Wimberly