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They confirm that the X-Pro2 is actually 4K capable, but they do not plan to add this feature via Firmware. But the X-T2 will definitely have 4K!
Here some excerpts (google translated):
We asked users of the X-Pro 1 if they used it for video and 80% of them said no. By cons, of course, you can make high quality videos FHD with the X-Pro 2. But according to our studies users do not expect 4K feature on the X-Pro 2. Technically, we could add this feature with a firmware update but we do not plan to do so in the future.
We will integrate the 4K video in the next models of the T series
At the beginning we wanted to develop a device of this type, but in the end we opted for the simulation mode (silver black and white films) obtained from color files. For us to judge image quality for a draw. Our tests have shown that visually, the image quality between a photo after an X-Trans sensor color then treated black and white film simulation and a photo of a monochrome sensor was identical. In addition, we asked our ambassadors photographers who responded that he had an urgent need for color images and they were not to use multiple field devices.
Plans for X30 Successor?
Currently not. This segment is very competitive with the presence of Sony, Canon and Nikon now (new range of compact Nikon experts DL). At present, we do not 1 inch version of our X-Trans technology. It takes time to develop.
What will come at Photokina 2016?
This is top secret! I can not reveal anything, but maybe new products will be launched at Photokina. You can perhaps guess!