Varavon has been teasing their Wire Cam (cablecam) product for a few years now, but they state they will officially open sales starting next week. We'll just have to wait to see. Here's the latest video demo using the BirdyCam2 gimbal placed below the Wire Cam.
The Wire Cam can be used with any 3 axis gimbal stabilizer, or with your camera mounted directly (though it won't be stabilized). You can already find a parts list, more video samples, and additional information at the Wire Cam product page (click here).
Varavon Wire Cam - Remote Cable Cam