All I have to say about the Canon EOS-1D X: 204,800 ISO?!?!
(For reference, the previous full frame "record" seemed to be the Nikon D3's 102,400 ISO.)
Other relevant specs:
Sensor: 18 megapixel (CMOS -- 36mm x 24mm)
Sensitivity: 100 - 51,200 ISO (Expanded: 50 - 204,800 ISO)
Continuous shooting: 12 fps
Shutter cycles: 400K cycles
Metering: 252 zones
Video: Quicktime MOV (1080/30p/24p, 720p/60p/50p)
LCD: 3.2 inches (1MP+)
Memory: 2 x CF
Ships in March of 2012!