I've seen a few pics of this device. It gives more versatility to positioning the handgrip. Does anyone who's been to NAB know what it is, and who makes it?
I was wondering the same thing and then I came across an interview with a Sony rep. Turns out, the FS700 is compatible with Arri film camera handgrips. So, Sony may be selling one as well in the near future, but Arri has made many similar extensions for their grips already.
"Another great feature of the FS700 is that it is utilizing an ARRI Rosette. So there's an ARRI Rosette on the camera body, and there's a matching ARRI Rosette on the handgrip, and a T-screw. This makes it very simple to adjust the location of the handle, but furthermore this is fully compatible with accessories that are made for film cameras. So let's say with a simple Arri handgrip extender you could relocate the handgrip forward and down if you're shooting with heavy long lenses. So this is a major breakthrough of this camera. No other camera in this kind of price range has something like this."
I wish they'd thought of this when they made the FS100. This feature is more important to me than 4k. The FS100 grip sucks.
I custom manufacture a fix for this issue. It's called a ClockArm. I'm launching now - and have about 15 in stock now. I'm an operator - they are the best thing made. Nothing touches them.