I received a tip that Panasonic will announce another Panasonic S type video-oriented full-frame camera. If you are planning to buy the upcoming S1/S1R mainly for video, it may be a good idea to wait a little bit.
I was also told that production samples of the S1/1R will be available in January-February 2019.
The announcement date for the Panasonic S type video-oriented full-frame camera is not known, but it will happen after the S1/S1R are available.