You are asking about root, but if you want usable root on the X you need two parts 1. Root Exploit, and 2. An Exploit that allows for disabling Write Protection.
When Write Protection is enabled (the phone's default state with locked bootloader, or the state you are in after you take the 4.4.2 OTA), any changes made to /system, or the like, (including, but not limited to, App installs, file modifications, deletions, renames, etc) are not permanent and are lost at power off/on.
Even if you have root, but lost Write Protection, any apps you've installed that need to write to system can't permanently save their changes (you have to re-do every time your phone powers off/on), and any Root type app, or app that gets installed to /system after WP is enabled will be lost at power off/on.
MotoWpNoMo was used on 4.4. and below to Disable Write Protection. Part of the 4.4.2 update patches the exploit that MotoWpNoMo used, so it wont work on 4.4.2.
SlapMyMoto/RockMyMoto/etc, used on 4.4 and lower, involved downgrading the rom to use an exploit in 4.2.2 to gain root. But with 4.4.2 you can't downgrade the rom safely, without risk of bricking your phone, anymore.
JCASE has already posted he has an exploit to use to gain root on 4.4.2, but due to job and family, wont release it until the fall. Who knows what ROM Moto will push out by then, and if they will have patched the exploit already. BUT before you get made at JCASE for waiting so long, that doesn't address a Write Protection dis-abler. I've not seen any talk about work on that for locked bootloaders (when you unlock the bootloader, like on Dev Editions, the write protection is disabled). So JCASE could release his Root exploit, he or someone could develop that process, but it would be kind of useless without the ability to disable write protection.
Trust me, *IF* or when a Root and Write Protection bypass is out, you will see threads on it. Until then, you have to sit tight.
If you are rooted with write protection disabled, you might want to check out the SafeStrap discussions over at Rootzwiki.com. That might at least afford you a way to run 4.4.2
And of course
@kj2112 suggestion of getting a Develpper Edition so you can unlock the bootloader and root no matter what rom version, is the best advice. Yes, its more expensive than a subsidized X, signing a contract, but its worth it if you *NEED* or *WANT* root & write protection disabled. (and selling your current X is an option to get cash towards the Dev Edition)