I just got this which sound very reasonable:
I got info that development of a7c ii started. Release is scheduled for one year after A7IV which will be announced late September. No specs are known both for a7iv and a7c ii but one thing is 100% sure that a7cii will be again just smaller version of a7iv. Also the overall body will be smaller than first a7c but according to schematics, evf will be bigger, probably with higher resolution.
Other sources already told me the A7IV is scheduled to be released in September.