Preorders:
In USA at Amazon. BHphoto. Adorama. FocusCamera.
In Europe at CalumetDE. WexUK.

There is a reason why this lens costs $3,000:

Sony A7sIII Preorders:
Sony A7sIII in USA at Adorama (up to $400 off with lens). BHphoto. Amazon. FocusCamera.
Sony A7sIII in EU at Fotokoch. Calumet DE. WexUK. Park UK.

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.

Matti Haapoja just posted the final and full review of the new A7sIII:

There is also a new Hands-on with the Sony a7S III at Dpreview.

And here is a In-Depth Look at the Data Rates:

Our reader Yukai (Thanks!) made this comparison between the four 85mm f/1.4 FE lenses: The Samyang, Sony GM, current big Sigma FE and the new Sigma lens that will be announced on August 6. If the comparison is accurate it shows the new Sigma is going to be the smallest of all of them.

Sony A7sIII Preorders:
Sony A7sIII in USA at Adorama (up to $400 off with lens). BHphoto. Amazon. FocusCamera.
Sony A7sIII in EU at Fotokoch. Calumet DE. WexUK. Park UK.

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.

Gerald Undone and Sara Dietschy unpack why Sony has still the edge over the new Canon’s.

One more thing:

UPDATED: Of the over hundred Sony A7sIII youtubers test I only saw TWO reporting an overheating issue. It’s Dan Watson:

And Hugh Brownstone (minute 10:47)

Now, I am pretty sure that because they are the only one having that issues this might be a setting issue or more likely an issue on this particular preproduction unit. I hope Sony will lend them another unit just to be sure that this is indeed only a single preproduction unit issue. That is not uncommon with preproduction samples :)

Sony A7sIII Preorders:
Sony A7sIII in USA at Adorama (up to $400 off with lens). BHphoto. Amazon. FocusCamera.
Sony A7sIII in EU at Fotokoch. Calumet DE. WexUK. Park UK.

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.

Ted Forbes shows us the new Sony A7sIII menu in full detail:

And because you asked me many times…I do not think Sony will give you the option to install the new menu on current Sony cameras via future upgrade.

Sony A7sIII Preorders:
Sony A7sIII at Adorama (up to $400 off with lens), BHphoto, Amazon. EU at Fotokoch. Calumet DE. WexUK. Park UK. Ebdn Ireland (Use code “A7SIIISAR”to get the actual 10% extra discount at checkout).

When Chris Hau got pitched by Sony with the A7sIII specs he wasn’t overwhelmed by it. But after trying it he changed his mind completely. This is a camera that meet all the needs and doesn’t fail on them (unlike the new Canon cameras).

And this is his friend’s Mattis A7sIII video:

Sony A7sIII Preorders:
Sony A7sIII in USA at Adorama (up to $400 off with lens), BHphoto, Amazon.
Sony A7sIII in EU at Fotokoch. Calumet DE. WexUK. Park UK.

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.

Sony A7sIII Preorders:
Sony A7sIII in USA at Adorama (up to $400 off with lens). BHphoto. Amazon. FocusCamera.
Sony A7sIII in EU at Fotokoch. Calumet DE. WexUK. Park UK.

For pure photographers:
There is more “photography” talent than you can think in the new Sony A7sIII. Chris Burkard (click here) and Renan Ozturk (Click here) shows us some gorgeous. Bigger pixels give you great dynamic range and clean High ISO shots compared to high resolution cameras

For video shooters:
To enjoy fullscreen folks: