Unfortunately, the info on XDA is clear as mud but what I can tell is that there is the very real possibility of bricking your device if you take the OTA after rooting or modding your system files. I am not entirely clear on what constitutes a system file nor does anyone else over there appear to be. And modding your system includes freezing system apps using Titanium B/U or any other app that can do it.
It looks like Motorola wants to stop those with locked bootloaders from rooting. To prevent this they have made the 4.4.2 bootloader so you can't revert back to any previous versions including 4.2.2 (which you need to do to root a device with a locked bootloader).
So the bad news is if your bootloader is locked and you take the OTA you will not be able to get root at this time and maybe never since it looks like Motorola is doing everything they can to patch the exploits relied on for achieving root. The worse news is if you have a locked bootloader and rooted or modded your system files and take the OTA without reverting completely back to stock, you will hard brick your device. Even if your bootloader is unlocked, if you don't revert completely back to stock you may brick your device.
So be careful and make sure you educate yourself before you take the OTA if you have tinkered with your device. While it is harder to brick a device with an unlocked bootloader, it is not impossible. One thing is clear - the Moto X is not a Nexus device and you should not be treating it as such and if you do, you may end up with an expensive paper weight.
It looks like Motorola wants to stop those with locked bootloaders from rooting. To prevent this they have made the 4.4.2 bootloader so you can't revert back to any previous versions including 4.2.2 (which you need to do to root a device with a locked bootloader).
So the bad news is if your bootloader is locked and you take the OTA you will not be able to get root at this time and maybe never since it looks like Motorola is doing everything they can to patch the exploits relied on for achieving root. The worse news is if you have a locked bootloader and rooted or modded your system files and take the OTA without reverting completely back to stock, you will hard brick your device. Even if your bootloader is unlocked, if you don't revert completely back to stock you may brick your device.
So be careful and make sure you educate yourself before you take the OTA if you have tinkered with your device. While it is harder to brick a device with an unlocked bootloader, it is not impossible. One thing is clear - the Moto X is not a Nexus device and you should not be treating it as such and if you do, you may end up with an expensive paper weight.