Here's a preview from B&H. Pricing is $11,800.

http://www.bhphotovideo.com/indepth/canon/news/hands-review-new-canon-ef-200-400mm-f4l-usm-extender-14x-lens

The lens is certainly aimed at those who need the ability to work quickly and deftly, and aside from the handling and speed afforded by it, the lens is also capable of producing imagery of the highest quality. The array of low-dispersion elements, fluorite and USD, coupled with the optimized optical structure and lens coatings resulted in imagery that left little to be desired. As with other L series lenses, the quality of imagery, overall performance, and design of the lens is suitable for any working situation, and the added benefit of this lens being able to produce such imagery with the convenience of both a zoom design and integrated 1.4x extender make it truly an effective tool that is ideally situated for sports, wildlife and nature photography.

Nice water drop bokeh :)