Just got my hands on the November 2011 issue of Asahi camera, and surprise! They already have a feature article on the EOS 1DX (p. 97-105).
A quick pickup of the Canon staff interview about the 1DX I find interesting (p.102-103):
Q: Why merge the 1D and 1Ds lines?
A: The original goal in the start was to make a camera that has both high res. and high speed, but not possible in the earlier period due to tech limitation. That's why there's 2 lines (1D, 1Ds). Now, with the tech. problem solved, the two have been merged.
Q: Why call it 1DX?
A: 3 reasons - 1. a "crossover" of 1D and 1Ds; 2. the top model, therfore "Extreme"; and 3. 10th generation counting from F-1.
Q: Why an increase in shutterlife?
A: A boost in FPS means there's a need to increase the endurance of the shutter. Changes in the drive mechanism makes it possible to boost shutter durability from 300,000 t0 400,000 cycles.
There's also mentioning that while there's a drop to 18 MP from 1Ds3's higher MP, the 12 FPS means that there's more load to process; that's where the muscles of Digic 5+ comes in handy. (The guy goes on talking about the new mechanism and how it improves noise reduction, but it's too technical for my limited knowledge).
As for the timing of the news release, the staff explains that it's a balance between the date when the camera becomes available and giving pro photographers enough information ahead of the London Olympics.