Sony is going to announced a new product soon: A lens with built-in image sensor, battery, memory.
This “lens-camera” transmits the images via NFC and WiFi to the smartphone/tablet! You can mount it on the smartphone but also use it separately! You will see the live view images on your mobile device.
The first lens-camera is to be released soon with a RX100 II sensor and a Zeiss lens! And there will be a second model with smaller sensor and larger zoom.