As the first Motorola release that Google had a lot of influence over, it is expected that the Motorola Moto X will be closer to the top of the list of released Android models receiving an update to Android 4.3. According to those who have installed the new firmware on their Moto X, the update brings improvements to the camera. Other new features of the update are far from final and are full of bugs.
The Motorola Moto X launched on August 23rd with Android 4.2.2 installed.
source: XDA via IntoMobile