The Canon Digital Learning Center has posted a lengthy article on the autofocus system in the new EOS-1D X and an also lengthy FAQ on the Cinema EOS system.

The EOS-1D X article is both an explanation of the AF system's features and a tutorial on how to use some of its functions.

The Cinema EOS FAQ includes 13 sections ranging from questions on the EOS C300's sensor to topics such as lenses, audio, working on set, post processing workflow, and more.