It has yet to be announced, we are waiting for it since long, but photographer Joshua Holko had the exclusive chance to preview the Canon 200-400mm f/4 IS with built-in 1.4x teleconverter. The video has been published at Luminous Landscape:
Recently, Australian photographer Joshua Holko had an opportunity to work with a pre-production sample of the exciting new Canon 200-400mm lens. In the video review below Joshua offers us an exclusive look at this lens in action and he discusses his opinion of early sample images.
Cool! Really hope that means the lens will soon be released.