Sony currently has three unannounced camera codes. This means we will see three Sony cameras to be announced within one or two months. According to Nokishita Camera, there is a possibility that all these three models are interchangeable lens cameras.
The upcoming Sony a7S III is expected to be announced in the second half of 2019. According to previous interview with Sony manager, upcoming Sony a7S III may feature with 10bit 4:2:2 and 4K video at 60p. And a trusted source also told us that Sony a7S III could feature with a new 15MP full frame sensor, while current a7S II has a 12.2MP full frame sensor.
After the Sony a7R IV (B&H Photo Video/Adorama/Amazon) officially announced, many photographers ask us whether Sony will announce the long awaited a7S III. ImgingResource has recently interview with Sony manager during the a7R IV launch event. Sony manager said that they are still working on Sony a7S III, expect official announcement will be later this year.
After the announcement of Sony a7R IV(B&H Photo Video/Adorama/Amazon), Sony currently still have 3 unannounced camera codes registered. One of these unannounced camera should be upcoming a9 II. The official announcement is expected in late 2019.