see also:

• Canon EOS camera system
• Canon EOS full frame dSLRs compared
• Canon 1D Mark III digital SLR
• Canon 1D Mark IV APS-H dSLR
• Nikon D4 sports dSLR
• 35mm full frame digital SLR cameras compared
• pro sports cameras compared including the 1D X

• announced in late 2011, this 18mp full frame dSLR designed for sports photographers and will compete with the Nikon D4 sports dSLR, and give burst rates of 12-14fps and boasts impressive HD video capabilities
• see my blog post
• firmware update in Oct 2012 allows AF with lenses at f/8 (eg. a f/4 lens with 2x TC)
• not yet compatible with PocketWizard TTL radio remote TTL flash

• dpreview.com's preview