Just announced: Canon EF 200-400mm f/4L IS USM Extender 1.4x Lens

The Canon 200-400mm f/4L IS USM Extender 1.4x Lens development announcement was made on February 7, 2011. Today, well over two years later, the offical announcement has finally been made.
Here is the Canon UK 200-400 IS Lens Press Release.
Click on the specifications link on that page to get more details about this lens - including its abilitiy to accept not-built-in extenders in addition to the built-in 1.4x. Adding a 2x III makes this a 560-1120mm f/11 IS lens. Image quality at these focal lengths remains an unknown of course.
My guess is that this lens will be in short supply with heavy demand - even at this healthy price.
Get on a preorder line: B&H | Adorama | Amazon
Overview from Canon
Designed to satisfy the discriminating needs of sports and wildlife photographers, the EF 200–400mm f/4L IS USM Extender 1.4X is a high-performance super telephoto zoom lens with an optically matched built-in 1.4x extender for maximum versatility. With a simple flick of a switch, the zoom range can be quickly increased to 280–560mm (f/5.6). This capability is extremely useful in applications where it is not possible to change lenses quickly, while also protecting delicate equipment such as a digital SLR camera’s image sensor in environments with dust and high humidity. The EF 200–400mm f/4L IS USM Extender 1.4X incorporates one fluorite and four UD lens elements, which provide excellent correction of chromatic aberration throughout the entire zoom range for professional quality images with high resolution, contrast and color fidelity, while a 9-blade circular aperture helps deliver beautiful, soft backgrounds. It utilizes inner focusing, ring USM, a high-speed CPU and optimized AF algorithms for fast and accurate autofocusing. And, with Power Focus mode, focus shifts are quiet and smooth, which is essential for filmmaking. Image stabilization is effective up to four shutter speed steps, with three image stabilization modes (standard, panning, and during exposure only) providing excellent results for a wide range of subjects. Optimized lens placement and coatings deliver outstanding color balance, while helping to minimize ghosting and flare. The lens is highly resistant to dust and water, enabling shooting even in harsh conditions. A fluorine coating on front and rear lens surfaces repels dust particles and makes the lens easier to clean.
I expect to have even more information available later today.
Posted: 5/14/2013 12:43:31 AM CT   Posted By: Bryan
Posted to: Canon News
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