Motorola has moved two of their device-exclusive apps to the Google Play Store. They remain device exclusive.
Motorola Assist, the evolution of Motorola SmartActions (first introduced a few device cycles ago), and Motorola Connect, an app that forwards incoming texts and call to the desktop Chrome browser, are both available now as free download. These apps are currently only compatible with the Moto X and the most recent lineup of Verizon Droids (MAXX, Ultra, and Mini) and should already be installed on said device out of the box.
The benefit of moving the apps to the Play Store, then? Most likely it has to do with ease of updating for now, but it could eventually lead to a wider deployment with greater device support. We have no reason to believe that will happen anytime soon.