The recently introduced Sony A7S III can also record high 4K frame rates up to 120p internally in 10bit 4:2:2, but a RAW signal is only output for external recording. Using an HDMI Type A connector, RAW video output is even in 16bit, with 4,264 x 2,408[16:9] at frame rates of 60p/50p/30p/25p/24p and various color spaces.
As always, Atomos is the first accessory manufacturer to bring the Ninja V monitor/recorder into play and announces a free AtomOS update for September, whereupon the Ninja V can create 12-bit ProRes RAW movies from 16bit RAW. (Also the camera is not supposed to be released until September).
Sony Alpha 7S III with the Atomos Ninja V
When shooting in external RAW, the A7S III is able to simultaneously capture an XAVC HS 4K, XAVC S 4K or XAVC S-I 4K file and proxy files internally, opening up nice backup and workflow options.
Sony itself, by the way, speaks of RAW recording with "compatible recorders" and calls the Atomos Ninja V as confirmed so far, which still leaves room for other manufacturers. As a reminder: after the 2.0 update the small Sigma fp also supports an external Blackmagic RAW recording with Video Assist 12G, which is a bit surprising.
First demo recordings are already available: