Meet the Hawk: a folding drone with a 2D/3D brushless gimbal, 4K camera, and dedicated watch controller. It is compatible with iOS and Android devices. The drone can be folded to fit in a carry bag. The camera can record 4K video @ 15fps, 2.7k @ 30 fps, and 1080p @ 60 fps.
The drone comes with a follow-me mode. It supports live video streaming to smartphones and tablets. Costs under $600 at this time.