This means that if Motorola wants to update the feature, it doesn't have to bother with pushing an OTA update to all users and deal with carrier testing and things like that. All Motorola has to do is push an update through the Google Play Store. This is definitely something we'd like to see more often.
Of course, the Touchless Control app is only available for the Motorola DROID MAXX, DROID Ultra, DROID Mini, and Moto X, and requires Android 4.2 and higher, which makes sense given the devices it will be on. And, it only supports U.S. English, U.S. Spanish, Canadian French, and Brazilian Portuguese, which makes for a pretty limited language set.
We'll be sure to let you know when someone over at XDA has cracked the app to run on any device. It probably won't be all that long of a wait. Or, you can always use our handy how to article to get Touchless Control-like functionality on your device right now.
Download: Touchless App