Check out the page on Techradar. And all our rumored specs got confirmed! Here they are:

10.2MP newly developed multi-aspect sensor provides sufficient margin to get the same angle of view in 4:3, 17:9, 16:9, and 3:2 aspect ratios.
world-first 4K 60/50p recording in Cinema 4K (4096 x 2160)
internal 4:2:2 10-bit recording with V-Log pre-installed in camera.
Dual Native ISO Technology
The 225-area AF arrangement stays the same, but the GH5S can now focus in light levels as low as -5EV (on the GH5 it’s -4EV).
max ISO 51,200
The Panasonic Lumix GH5S will be available from the end of January priced at £2,199/$2,499 (body only)

Preorders:
GH5s at BHphoto, Adorama, Amazon and Panasonic.

via Nokishita

A reliable source sent me this info. Please be aware that so far I couldn’t double check this. But the source was right with past rumors so there is a fair chance he might be correct on this one too:

The GH5S will make use of a new, multi aspect ratio sensor and subsequently lose the IBIS system. It would seem to be confirmed that it will be using Sony’s IMX294CJK sensor.
This is one of the biggest changes to come from the new variant. Designed to work in higher budget production’s alongside the EVA1, even using the EVA1’s dual native ISO system (800 & 2500).

Thanks!

Preorders:
GH5s at BHphoto, Adorama, Amazon and Panasonic.

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The GH5s will be announced tomorrow (Monday) at 10am Las Vegas time. To not miss any future rumor and news join us here:
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The GH5s key specs:

• The camera records C4K (60p, 150Mbps, 4:2:2 10 bit Long GOP)
• The camera records slow motion at 240fps (FHD).
• 12 Megapixel sensor with up to 100.000 ISO
• Price 2499 Euro
• Shipment start late February/early March

Join the GH5 and GH5s facebook group to discuss the new camera.

These are the first official images of the Panasonic GH5s. And it seems like we were really spot on with our previous Gh5s image leaks! There is the red ring on the dial and the red Record button :)

The camera will be announced on January 8 and you can follow the live blogging here on 43rumors!

via Nokishita