At the Apple event for the presentation of the new Mac Pro, as reported, there was also a lot about very high-resolution video -- ProRes RAW in 8K is said to have been shown there in multiple versions for demo purposes (more about this at another place). On the one hand, pictures from a nature documentary, which gave rise to speculations that they could have been taken with an 8K Nikon camera -- this has meanwhile turned out to be wishful thinking, at least according to the Atomos agency in Kenya (among other things) another camera was used, which was also used at the WWDC: A greenscreen setup was set up there, with an 8K-capable Canon Cinema camera enthroned on a Mia robot arm as the main actor -- but it worked somewhat incognito, as information about it had been spreading for a few days only via the video report of a YouTuber.
Accordingly, the 8K signal from the camera was recorded by Atomos Shogun recorders in ProRes RAW, and then processed in Apple Motion (on an iMac, by the way). Note the plural in Shogun recorders, because to take 8K 25/50p out of the camera for external recording, a 12G SDI connector is not enough, two 12G signals must be output and recorded from as many recorders; for 8K RAW in 50/60p, four 12G connectors and recorders are needed -- or a 24G SDI output, but the technology is not yet ready. The prototype has several SDI jacks (unplayed, it wasn&t a live demo, as the setup suggests). Before such a two (or four) split image can be further processed, it must first be combined into an 8K stream.
The development of this 8K camera is no secret now, but was already announced by Canon in 2015 -- it should have a Super-35mm CMOS sensor with 8,192 x 4,320 pixels effective resolution, the sensors are accordingly small.
Since then, prototypes have been seen in various stages at trade fairs, for example at IBC 2016, then still in temporary and expansive design, and at InterBEE 2018 in the classic Cinema EOS form factor. In January, by the way, there was also information circulating about the plans for a 8K-capable camera within the EOS R series, but without a specific time.
In February followed the release of the video "Miyazaki, Roots of Japan", which was recorded with the Canon Cinema EOS in 8K. A set photo shows the separate (and somewhat unwieldy) recording setup with several monitor recorders next to the camera.
With the Canon 8K Cinema EOS you can now produce video in 8K, although not quite comfortable. Since Canon didn&t use the opportunity offered by Apple to announce the camera, a soon availability doesn&t seem likely. After all the signs in Japan for the Summer Olympics next year are 8K, the NAB 2020 should be exciting in this respect.