This seems to be the new thing for camera manufacturers. They don’t just announce new cameras now, they announce than an announcement is coming. Or that a new camera is in development. Nikon just did it with the D850, and now Sony are doing it with a new 4K CineAlta motion picture camera.
Sony have given us a little more information than Nikon did, though. Their new CineAlta camera will use an entirely new full frame 36x24mm sensor, designed specifically for digital motion picture capture. It will also be compatible with current and new accessories for the CineAlta cameras.