I wouldn't be surprised if its just PR speak for using one of the phone's cores to track activity. Think the 1520 does it.
From voice and location recognition to speed and temperature monitoring, the Qualcomm? Snapdragon™ sensor core is designed to take in and intelligently use information from a variety of sensors to make some incredible mobile experiences happen—all while using as little power as possible.
At the heart of some of the most advanced smartphones and tablets, the sensor core in a Snapdragon processor is designed to keep your device ready to receive data from your device’s sensors and then efficiently enable advanced features that help with GPS, gaming, camera stabilization, health monitoring and more.
