Atomos has a "test" firmware from Sony installed into their FS5.

Here are some screen shots. Although 30p and 60p RAW were working at NAB, the automatic variable ND was locked out.

It also looks like you can record a 1080 copy in XAVC at the same time you are outputting 4k RAW.

The proof:

Sounds similar to the FS700 with Odyssey though 700's internal record is AVCHD of course.

Chris Young
CYV Productions
Sydney