Update: A press release from Panasonic says “S full-frame mirrorless cameras and lenses will be available at the end of March 2019”.
There should be more news on this within the next few days, but for now, here’s a summary of what we know, in pictures and text (and a video at the end):
Price is expected to be around $4500, I would assume that’s just for the 47 MP model and the 24 MP significantly cheaper. RAW video is rumoured. Panasonic will release 24-105mm and 70-200mm f/4 lenses, not f/2.8, as was previously thought. This is in addition to a 50/1.4 and the existing Leica L mount lenses, five primes and three zooms:
So there should be 11 lenses for the system when the Panasonic S1 and S1R launch.
At the end of the second of the following two videos, you’ll see that Annie Griffiths is talking about taking eight images in quick succession and “all of a sudden, eight images are strung together to make the most beautifully detailed image”. Given that she is a landscape photographer, this is, in my opinion, more likely to refer to a super-resolution capture mode than to focus stacking, HDR or post-focusing.
And a wildlife photographer and Panasonic ambassador’s opinion on the S series: