The new system to keep your eye on is the Shot-over. It was created by one of the guys instrumental in making the Cineflex. Think of a Cineflex with interchangeable camera payloads, as well as 3D in the future.
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It can be loaded up with the Arri Alexa, Red EPIC, or Sony F35. Super stable, small, no Vne limits. Nice demo video on their site.