AKED-M

So here's the video I promised. I tried to duplicate Max's AF scenario as best I could. None of these clips have been edited and none that I shot were left out. Everything you see is everything I shot. Very different results. What can I say? As I've said before, these results are extremely typical for everything I've shot thus far. I've never shot a single clip that even remotely resembles what Max got.
 

Impressive real world stabilisation. Check from around 45 seconds when water droplets appear on the lens to see the action of the stabiliser. This footage would be unusable on a camera with less stabilisation and more rolling shutter.

GH5 Manual is online:https://eww.pavc.panasonic.co.jp/dscoi/DC-GH5/EG_EC_EF_EB/DC-GH5_DVQP1121ZA_eng.pdf

GH5 Manual is online:https://eww.pavc.panasonic.co.jp/dscoi/DC-GH5/EG_EC_EF_EB/DC-GH5_DVQP1121ZA_eng.pdf

GH5 demo reel filmed in Yokohama
https://www.youtube.com/watch?v=5RacTSKuNuo&t=2s

GH5 demo reel filmed in Yokohama
https://www.youtube.com/watch?v=5RacTSKuNuo&t=2s

GH5 demo reel filmed in Yokohama
https://www.youtube.com/watch?v=5RacTSKuNuo&t=2s

GH5 IOS test, 8 to 10 bit comparison and also to the GH4
 

GH5 IOS test, 8 to 10 bit comparison and also to the GH4
 

GH5 IOS test, 8 to 10 bit comparison and also to the GH4
 

Matt Frazer about Autofocus:
 
GH5 Focustracking Test:
 
GH5 autofocus tracking  Zoom 40mm low light at 3200 iso
 
GH5 Autofocus and Dual IS testing
 
Setup for Back Button Autofocus for GH cameras
 

here some information about the sensor of the GH5 from a german Forum, who has collected these infos from different sources like interviews, videos etc.
it is definitively another sensor as in the E-M1.2 and GH4 and another design
The high Iso Performance is supposed to be much better than in the GH4, there is talk about up to 2 stops (An ISO 6400 of the GH5 shall look like an ISO1600 of the GH4). Unfortunately there are no RAW pictures available at the moment to prove that.
RAWs will not be denoised by internal software
The design of the sensor leads to a faster read out that reduces the rolling shutter. The E-M1.2 Uses the brute-force approach with a lot of calculation effort. Panasonic says, that this will lead to more noise in the end, especially during video. This is the reason, whether decided, to design a totally new sensor. The rolling shutter also is not reduced by the software. 
the debayering is not done on a 2x2 Field but on a 6x6 Field. This leads to truer colours and to less artefacts. If the RAWs have 14Bit Colourdepth is not clear.
all cameras that are tested at the moment have a beta firmware, which is optimized for video. This is why there are no or not many photos available yet.
FW 1.0 will be "conservative" That will not use the full potential of the prozessors/sensor yet. Only with future firmware updates, the full potential of the sensor will be used.
Updates for the photo abilities Are on the "internal" roadmap, but are not communicated yet. . 
Higer framerates in serial picture mode are possible but may not be used due to the 4K/6K functions .

Has this been posted?
 
https://s04d.storage.yandex.net/rdisk/ea5a52ab6f166485504def18edbd765a9227204439dc72d1d9a20eabca3e807b/58800d30/1A6YoTnKCjjYtnUnKO2EeQKkBlqQGcC8mRmx-cAOZzhNqSaae4SXdMAF2MNWNnRuPnXbjUfflWZ06trMy0Rc3Q==?uid=0&filename=GH5_presentation_161226_Final.pdf&disposition=attachment&hash=DRnUU9msfNyIzmR6jQG3ghFH5VOLnI7%2BbC/SAFjR/7I%3D&limit=0&content_type=application%2Fpdf&fsize=4982440&hid=254fbfcd45972f69d42257dec9fe414b&media_type=document&tknv=v2&rtoken=zdMfLQM9f3YZ&force_default=no&ycrid=na-b64ee16ab8994786923cefdfbf607b39-downloader4d&ts=54667e939ac00&s=c3fd7f12c2ee17185c5421cc7288f2eeaf129bd3f6bfbc2bd7c518e5af6610f2&bp=/42/7/data-0.21:50117435719:4982440&pb=U2FsdGVkX1_a4HKHDhJQEURADl1VQipzMAr5dlcjWjK4eh5bVofhnS6wFu-x6Paua2-2xGze2ZQdi3QATr9QG9gD_E92Q-xNQ8f2xGIGhYc=

Well, I have done star Timelaps series thoughout several nights, we went for a walkn in the black forest in heavy snow on the camera. All good.
I am happy that the GH4 is weather sealed. 

@Jn-   I have installed the firmware update 1.3 on my older 12-35 yesterday and this is what the Panasonic download Website http://av.jpn.support.panasonic.com/support/global/cs/dsc/download/fts/index2.html wrote about this Firmware update:
Update Contents for H-HS12035
Improvements 
Date/VersionDescription
2015/08/05
Ver. 1.3Dual I.S.( Image Stabilizer ) is available by this firmware update.
(in case of the usage of Camera with this function)
* Dual I.S.：Innovative Handshake Correction System by the ideal combination of lens I.S and Body I.S.
 
I hope that helps.
I dod not find it for the first 14-140 or the 100-300