The tone of the poster is quite firm. It *seems* that he has known something. It is told that the press release will be held at 2:00 p.m., Beijing Time (UTC +8:00). Below is a brief list of the specs:-
Name: Canon EOS 1DX
Sensor: 1800 Megapixels
ISO: Up to 51200, Expandable to 204000
Shooting Speed: 14 fps
AF: 61-point System
Other New Features: Built-in Multiple Exposure, Built-in LAN Port
Besides, it is discovered that the official "product speaker" of Canon DSLRs in China, the Hong Kong movie star Jackie Chan, has arrived in Beijing the day before:-
http://forum.xitek.com/showthread.php?threadid=926331
Of course, you can take all these as grains of salt, as nothing could be verified.
Update 1 (11:45 a.m.): Canon Rumors have had much of the leaked information, including the following finder view and the AF layout. I would now regard the 1D X has been confirmed and it is real! :-)
Update 2 (14:00 p.m.): Canon Japanese 1DX webpage now has all the official information over there. The "full" specs are there, but some parameters including the weight are not yet published. There is also a sample page, but still pictures are in really small size and the movie samples are edited (there are no Full HD original for download neither). Nevertheless, some of those more interesting official pictures are linked as follows:-
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