Photo Rumors released a set of leaked specs for the two successors of the a7C. Sony Alpha Rumours first mentioned that the a7C would receive two successors, but Photo Rumors is the first to provide detailed specs of either cameras.
Sony a7C R Specs (Rumored)
– 61-megapixel sensor inherited from α7R V
– AI subject recognition
– New menu
– Better AF system

Sony a7C II Specs (Rumored)
– Same 33-megapixel sensor as α7 IV
– BIONZ XR processor and AI processor
– 5-axis in-body camera shake Correction
– Continuous shooting up to 10 frames per second
– Common sensitivity is ISO100-51200
– 4K60p 10bit with S-Cinetone
– 2.36 million dots EVF
– 3 inch 1.03 million dots touch type vari-angle monitor
– 759 points real-time eye AF
– Breathing correction
– Creative look and beautiful skin effect

There is some doubt in the community as to the validity of the leaked specs from Photo Rumors, without any validation, these should be treated with a grain of salt, but if untrue, we do not expect the actual specifications to are too far away from what is listed above.