Blackmagic Design has released ATEM Switchers Update 6.0 which adds support for controlling cameras from ATEM production switchers via the program feed to the camera.
ATEM Camera Control is compatible with the new Blackmagic Studio Camera when running software update v1.8.2 or later.
Blackmagic Studio Camera HD and Studio Camera 4K models feature optical fibre and regular SDI program return feeds to the camera and the commands from the switcher are broadcast to all cameras via this program return feed.