I just watched the video, and wow, what a load of crap!
This is what Canon's 61pt AF system (and before that, their 45pt and 19pt AF systems) have been doing for years! This is exactly what Canon's AF systems do in all points mode...they LOCK onto a subject, then track that subject. With the 5D III and 1D X, the AF system is also very highly configurable, and comes with several preconfigured AF modes for different kinds of subject motion, as well as full custom configurability. (You can even assign different AF modes to different custom user dial modes for quick and easy access.)
Canon's system allows you to do full subject tracking in all points mode, but also has several zone modes (where instead of using all AF points, it will just use a selected zone of AF points that you can move around the entire grid), as well as expansion modes (where it will let you pick a primary AF point, and then utilize either the four or eight surrounding points to assist). Canon's tracking is also better than what was demonstrated in the video...the reviewer was trying to say that the camera did not lose focus on the guy in red, but it WAS losing
focus...because by the end of the sequence, both the red and black guys who were crossing paths were OOF. Canon has a configurable tracking "switch rate"...it will try to keep focus on it's previously tracked subject (using a hysteresis of the previous AF frames) for as long as you configure it, then switch to a closer subject. You can configure this tracking switch rate from very slow through very fast. Canon wouldn't have lost focus on the red player at all, period.
Another thing about Canon's AF system, especially on the 1D X, it would NEVER lose the subject's face. In the video, the Sony was focused on the guys chest and knees most of the time, but no one want's a knee in focus and the face slightly out of focus. The 1D X ties the meter and AF system together via a dedicated processor that can do face recognition (which, actually, works with birds and dogs as well, possibly other wildlife.
) Once the face is identified, Canon can maintain the AF lock on the same subject, and on his face, the whole entire time.
So, I'm sorry, but the reviewer in this video is full of crap when he says this kind of AF system has never been done before. MASSIVE LOAD OF BULL SH*T!!