http://gizmodo.com/new-autonomous-3d-robotics-drone-follows-you-wherever-y-1631694870

But the Follow Me feature is definitely the coolest upgrade. This
third-person view mode will be immediately exciting for anyone doing action
sports, since it not only follows you around but also controls the gimbal to
keep you in the center of the camera frame while you pull off stunts. The Iris+
can become your own personal aerial cameraman that sticks with you over every
jump or down every trail—so long as you're toting a GPS-enabled Android device
and there aren't too many trees to trip it up. It even boasts a custom app for
the Pebble smartwatch so you can tweak the flight during your ride or run. A
LIDAR or depth-camera based avoidance solution would come in handy for those
aforementioned trees, but you'll have to supply that yourself.

Thanks to Russ Brown.