The upcoming Sony Alpha a7S III is rumored to be announced in Spring of 2017 next year. According to latest rumors, Sony Alpha a7S III will have an RGBW sensor. RGBW sensor means much brightness and less noise than current RGB sensor on a7S II.
The upcoming Sony Alpha a7R III and a7S III is rumored to be announced next, the a7S III seems already get leaked several days ago. Unlike rumored Sony Alpha a9, the a7R III will be stay the same size and designs. Below are top 20 features expect from Sony a7R III and a7S III mirrorless cameras by Dave Dugdale from LearningVideo. According to Dave, Sony seems to be really listening what photographers said.