Android 4.4.4 is a thing now, but Sprint Moto X users will have to make do with 4.4.3, which is heading out starting today (build KXA21.12-L1.22). This is one of those times you're going to have to wait your turn, as the OTA is going out in waves.
Here's the changelog posted by Sprint.
- Android™ 4.4.3, KitKat® - Android 4.4.3, KitKat, is the latest release of the Android platform. This release includes several stability, framework and security fixes in addition to accuracy improvements to the power profile.
- Camera - Improved image quality - Improved camera image quality including better consistency of exposure, more realistic flash coloring, improved photos in low light conditions using front camera.
- Camera - Pause video recording - Added the ability to pause video recording with a convenient pause/resume button on the viewfinder.
- Updated Phone dialer - Updated Phone dialer with a new graphical layout and colors to improve consistency and usability
You'll get a notification when the update is ready to download. At that time you can start complaining about the lack of 4.4.4 on the Moto X.