From what I've read, the main feature is a low power, always on, sensor array. My guess is that this phone will break new ground with comprehensive and novel Go

From what I've read, the main feature is a low power, always on, sensor array. My guess is that this phone will break new ground with comprehensive and novel Google Now integration, and push further towards the goal of a device that actively assists its user. Think of it as a robotic system that is integrated into the growing AI/expert system service that is Google.