On September 11 at 9am CET time Sony will have a press conference at the IBC show in Amsterdam. And you can follow the event live on the following Sony Uk page. I will also embed the live streaming on SAR.
Sony will ddefinitely announce a new E-mount 4K camcorder. There is a very small chance the might announce the A6xxx too. There is almost near zero chance to see the new A7sII. The PhotoPlus show in October is the more “ideal” place to announce the A7sII.