If you have a Motorola Moto X and just cannot wait for Android 4.3 to be released for your device, you can try flashing a new build that has been put together from resources dumped off a test device. XDA member jimmydafish posted a zip file that includes everything needed to load this particular Android 4.3 build onto your Moto X. You do need to have an unlocked bootloader. Whether you would really want to do this may be questionable though as even jimmydafish indicates in his testing that it seems to run slower than the current build of Android 4.2.2 on the Moto X. He does indicate the camera app seems to be an improvement.
To fastboot flash the system onto your Moto X, just follow the source link to find the zip file containing the necessary bits along with instructions. Just remember you are taking things into your own hands as far as the continued operation of your device, so be sure you are willing to live with the results whatever they may be. If you do undertake this install, be sure to post here and let us know your impressions.
source: XDA Developers