18 megapixel APS-C 1.6x Crop, new sensor process designed for low noise
8fps
Dual Digic IV, new 14-bit ADC circuitry
New 19-point AF circuitry, allowing you to group AF points into 5 regions as well, all points are crosstype with f/5.6 or faster lenses, the center point is additionally sensative with f/2.8 or faster lenses.
100% viewfinder with LCD overlay, allowing a level and gridlines to be projected on the screen, apparently uses parts of the EOS-1D Mark III pentaprism in its design
New 63-zone iFCL meter, iFCL = intelligent Focus Color Luminance, basically its a color meter, tied to the 19-point AF, promises better accuracy
Exposure compensation is now +/- 5 stops, Also AEB has been improved but not sure how.
Sounds like its FULLY weathersealed, Not half-weathersealed like the 5D Mark II, but I could be wrong
Shutter based on the unit in the 5D Mark II, 150,000 cycles.
3" Rear screen, upgraded version of the one in the 50D and 5D Mark II, supposedly more glare resistant and has a wider viewing angle
Video is 1080p at 24, 25 or 30 fps, or 720p at 60/50/30/25/24 fps, has manual controls, gridlines and the virtual level available
Expect a lot of technical advances to debut in this camera, giving a lot of clues as to what we'll see when the 1D Mk4 appears