Isotta is shipping their housing for the Sony a7S III. It has a 120mm bayonet port mount and can be fitted with two fiber optic or electrical flash sync bulkheads. It is also supplied with two M16 and one M24 port, to allow for HDMI out if required.
Nauticam are shipping their housing for the Sony a7S Mark III camera. Focused on video centric features, the housing has an N100 port system and an M24 bulkhead to allow for HDMI 2.0 output to an external recorder.
Sony has announced the Alpha 7S III full frame mirrorless camera. It has a 12.1 MP sensor that can capture 4K 120p 10 bit 4:2:2 video with a native ISO range of 40 to 409,600. Internal recording is to 2 CFexpress cards. It also allows up to 4K 60p 16-bit RAW output to an external recorder via HDMI Type-A.