Geekanoids unboxed the new E-m10III. And the French site Focus Numerique (google translation) posted their E-M10III review. This is their Pros and Cons List:

And there is also a review at Photographyblog:

While E-M10 Mark II owners won’t be rushing to upgrade (unless you really, really want 4K video), the new Olympus OM-D E-M10 Mark III is a solid, if rather unexciting, update of a camera design that a lot of people love, ourselves included, all at a very competitive price-point in today’s market. Highly Recommended!

Preorders:
Silver or Black E-M10III at GetOlympus, BHphoto, Adorama and Amazon. In Eu at WexUK and ParkUK.
E-M10III with kit lens at GetOlympus, BHphoto, Adorama and Amazon.
Special E-M10III superkit at Amazon and Adorama.
CS-51B Body Jacket for the E-M10III at BHphoto.

Chris Eyre Walker just sent me this:

I recently spent 3 weeks on assignment for Olympus AU attempting to summit Lenin Peak (7134m) in Kyrgyzstan. My goal: find out if the E-M1 Mark II would perform at high altitude and in extreme weather conditions and if it would make for a suitable expedition camera to extreme environments.

Part I: https://youtu.be/uoLSdLxksTs
Part II: https://youtu.be/cPCkaTKbGmE

(entirely filmed on the E-M1 Mark II and with the 12-100mm f/4 IS PRO)
Also here the in depth Blog Article and my new Lightroom Preset Pack based of the shots of this expedition.

E-M1II at [shopcountry 66559]

The new Panasonic AU-EVA1 can be preordered at BHphoto

This is the first short film shot on Panasonic new 4K camcorder: