Canon EOS-1D X

Some new features that caught my eye;

Magnesium alloy body with 76 dust and weather sealing gaskets
Numerous interface refinements relative to the EOS-1D Mark IV, including two pairs of user-configurable buttons on the camera’s front, a reworked button layout on the back that includes two multi-controllers and a touchpad within the Quick Control Dial meant for making silent adjustments to such things as audio levels while video is being recorded
17.92 million image pixel full-frame CMOS sensor. Image dimensions at full resolution are 5184 x 3456 pixels. Among the file format settings are full-resolution RAW plus two reduced-resolution settings: M-RAW (3888 x 2592 pixels) and S-RAW (2592 x 1728 pixels)
Optical viewfinder with 100% frame coverage and optional grid display
12fps top shooting rate with full autofocus, metering and other camera functionality; up to 14fps is also possible with the mirror locked up and the camera recording JPEGs only. At ISO 32,000 and above, the EOS-1D X’s maximum frame rate drops to 10fps. (The number of JPEG, RAW and RAW+JPEG pictures that can be shot in a burst has not been finalized.)
All-new mirror and shutter mechanisms (the latter has a durability rating of 400,000 cycles)
A top shutter speed of 1/8000 and a standard top flash sync speed of 1/250
In-camera multiple exposures, with several options for how the camera captures and blends the frames
In-camera RAW converter
HD video capture at up to 1080p/29.97fps or 720p/59.94fps with new H.264 compression options and timecode embedding (but no RAW video option and no continuous autofocus during capture; the new camera’s video mode appears to have received mainly incremental improvements)
Gigabit Ethernet wired networking built right into the camera and providing the same set of functions as one of Canon’s WFT-series wired/wireless transmitters (though only over a wired link to the camera, obviously)
3.2-inch (diagonal), 1,040,000-dot rear LCD featuring Canon’s ClearView II technology
Twin CompactFlash slots with support for fast UDMA 7 cards
Compatibility with the new WFT-E6/WFT-E6A 802.11a/b/g/n wireless transmitter and GPS Receiver GP-E1