Meet the Panasonic HC-WXF991: a 4K camcorder with WiFi and a built-in twin camera for PIP recording. It has a LEICA Decoma Lens with 20x zoom and 5-axis optical image stabilization. You also get in-camera editing and effects (e.g. slow/quick motion, 4k post cropping, zoom).
Thanks to the second camera, you can capture picture-in-picture videos. Link the camcorder to your mobile device to do even more.