From the sonyalpharumors report, Sony A7S III was finally been unveiled.
It features optimized video, optimized sensitivity, optimized speed
New 12MP sensor with fast readout and S-Cinetone color science
records FHD 240fps, 4k120fps 10bit 4:2:2 and 4K120fps raw over HDMI
ONLY Up to 4k60 will be 10bit 4:2:2 internal.
Down sampled 1080p from 4K, making this the best 1080p hybrid ever made! No line skipping or pixel binning.
No internal RAW.
Base ISO 160 for S-LOG3
no Dual ISO
Max ISO 409600 (video)
16bit RAW output
Sony claims 15 stops dynamic range
Movie Edit add-on compatibility for Image Stabilization in post
world’s highest resolution new 9.44 million dot EVF (QXGA resolution)
same Sony A7rIV AF system
new kind of passive (noise-free) cooling system
no overheating, no recording time limits (They are claiming to not have overheating issues for at least 1hr even at the highest framerate.)
UHSII card and CFexpress Type A card support (each of the two slots takes them both!)
Looks pretty like a Sony A7rIV.