Indeed, and that's a trend...
The idea behind is to built them around aluminum billets on CNC, so likes the Jobu or Wimberley will be a waste of material, and being easier to pack. Nevertheless those pieces connects to each other by arca-swiss joints, so essentially without movement when tight. Also they can double as panoramics heads.
The Wimberley falls short in two aereas, that I really like they could address: the bearings and the locking mechanisms
The ones like this Kirk (have not yet one on hand), the RRS, and with another approach, but with the same resukts, the Mongoose, are much better towards locking systems and bearings. Namelly the RRS and the Kirk have needle and ball bearings to attain no wooble movements on their arms. The Kirk, brings an innovative tension/locking system, thought.
But again, there's no free lunch, and the Kirk and even more the RRS approaches the weight of a good fluid head, without its inherent benefits.
I discover another interesting gimbal, an Italian one, full carbon, the Zenelli:
http://www.zenelli.it/it/tecnologiaAnother great piece of machinery comes from ProMediagear, the Katana:
http://www.promediagear.com/GK-Katana-Gimbal-Head_p_8.htmlLook at this video about the difference between a fluid head and a gimbal featured by a well known Israel wildlife photographer
https://www.youtube.com/watch?v=3k-a1A6zs_0&t=727s