srbell if you remember the pictures from some fairs, there were gimbals around with fs100 on them from DJI etc. And another test videos were seen in the forums with reds on them. So i am pretty sure that we will see something in that league pretty soon. At the same time a Gopro gimbal was seen, necessary is a different question.
They will probably act upon the GH3 in which form we don't know. Hopefully some adapters/mods and not a completely new gimbal.
I don't think thought that they will start with gimbals that can be adapted for different cameras and lenses. Think they will stick to their out of the box working approach.
Boris