I'm quite impressed by the fact that DJI releases a new product like the Ronin SC but doesn't makes sure that all accessories are available. I guess a lot of GH4 users like me will buy the SC but the poor little piece of cable allowing you to connect the gimbal to the camera is not available and there are no information on when it will be... well done DJI.
I'm sure there must be a way to mak your own from a 2.5 jack and a USB-C cable but my electronic knowledge doesn't reach that far.