Image courtesy: ePhotozine.

Vitaly Kiselev from Personal View shared his insights on the GH6:

• Panasonic wants to add 8K support, most probably at 24p only
• m43 sensor can be first present only at GH6 presentation time and will be exclusive for 1-2 years
• 8K support can be interpolated (from around 6.5-7K), but can be true 8K, depends on sensor version Sony chooses
• Next focus will be improving high frame rates
• AF will be kept at same level, slightly faster, just with more options
• Will use this EVF – https://www.personal-view.com/talks/discussion/19797/meet-first-gh6-part-1600×1200-resolution-oled-evf#Item_1
• GH6 can be first camera with AI and cloud based features with monthly cost
• Other features can be possible to be enabled permanently, but paid, similar to V-LOG license
• Panasonic also wants to account for big currency fluctuations
• So, price will rise compared to GH5, but it can be GH6V (value edition) with 8K and other features disabled that you can buy later
• GH lineup, after one year of introduction, will be 3 cameras – GH6V, GH6 and GH6X (top one, similar to mix of G9 and GH5S)
• First announcement round will be Photokina 2018 and spring Photokina 2019 or CP++ will be release time

My two cent: The specs might be close to the real Gh6 camera but I have a hard time believing Panasonic will announce the GH6 at Photokina this year. At earliest I expect it to be announced in May 2019.