It will be the 1D X.
http://www.canon.com/news/2011/oct18e.html It is mentioned down the release.
(specs not confirmed at time of posting)
Canon EOS-1D X
Full Frame
18.1MP
Dual DIGIC 5+ – 17 Times The Processing Power of DIGIC 4
ISO 100-51200 Native
100,000 Pixel RGB Metering Sensor
EOS iSA (Intelligent Subject Analysis)
61 Point AF
21 f/5.6 Cross Type Sensors
20 f/4 Cross Type Sensors
5 f/2.8 Cross Type Senors
EOS iTR AF (Intelligent Tracking & Recognition Auto Focus)
12 Frames Per Second
14 Frames Per Second JPG Only
400,000 Shot Rated Sensor
Ethernet Connection
March Availability