So the firmware update improved the RTH function by allowing you to use the controls and film (basically on autopilot) catching angles using gimbal yaw (up / down) and drone yaw (360 degrees on X axis) I believe.
If you attempt to use Drone yaw manually the direction the drone is travelling in changes ?
i.e.
RTH function activated I can spin 360 degrees and continue to travel in a straight line back to the home point
verses
Manual flying, where try spinning 360 on the move, you would change course depending on where your right stick is positioned?