Awesome! Thanks for that. Was somewhat concerned that some of my fast MF-only glass would become unusable like it is on the 7D, but it looks like it will be ok on the 1Dx based on your link.
@Picsfor - I prefer the build of the 1D series significantly over the 5D series. Additionally, I'm excited about the new sensor, specifically using it in low light situations where I typically prefer to use manual focus (even though AF systems are getting better in low light settings, I still find MF quicker and more accurate). Also, it would be a pity for fast Zeiss glass to be essentially unusable at max aperture.
@Picsfor - "who needs MF, and if you do, just use a different camera," nice, helpful answer. Also, the AF system never cares what aperture you use, only the max aperture of the lens. An f/2.8 max aperture activates the most precise points, but accuracy is driven by the f/2.8 baseline for triangulation by the AF system, even with an f/1.2 lens. That means MF has the potential to be more accurate with a lens faster than f/2.8, if you can install a focusing screen that shows the true DoF of a lens faster than f/2.5 (the approximate cutoff of the standard focus screen).
@Isurus - should be possible. The Canon USA page on the 1D X lists five different focusing screens (and the popup compatibility lists do include the 1D X).