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Motorola themselves confirmed the rollout of Android 4.4.4 has started for their phones. For now they specifically mentioned only the Moto G, the Moto E and the Droid Ultra, and these are only in specific regions at this time. The widespread rollout will continue for these and most of their devices over the next few weeks.
On top of the usual features from Android 4.4.3, including a new dialer, the ability to pause during video recording, and enhanced camera image quality, the Android 4.4.4 update also includes some additional bug fixes and security updates.
It seems as if Moto plans to bring the update to as many of their devices as possible with this rollout. Here's a quick quote from them,
Android™ 4.4.4, KitKat® Begins Rolling Out - We’ve begun rolling out Android™ 4.4.4, KitKat® to our phones! This latest update includes all of the goodies of 4.4.3—such a new dialer, the ability to pause during video recording, and enhanced camera image quality—and includes enhanced security for OpenSSL. We just started rolling out in Brazil and India for Moto G; in Brazil, France, Canada, and Asia Pacific for Moto E; in the U.S. for DROID Ultra. We are always working to deploy the latest software as fast as possible and expect the update to come to many more phones soon. Check out the software updates page to see if your phone has been upgraded yet.
As you can see, they have a software updates page listed which can help you determine if your device is soon to get the update or not. Sound off if you have received yours.
Source: Motorola Blog