New Sony A7sIII accessories:
You will also have to preorder the world’s first CFexpress Type A cards at Adorama, BHphoto. Amazon.
And of course the new Sony MRW-G2 CFexpress Type A/SD Memory Card Reader at Adorama and BHphoto.
There is a useful Sony A7sIII FAQ page at Explora. They also have posted a special camera specs comparison post (Click here to read it all) .
And here you have two panel discussions on the new A7sIII: