Rich,AF works on continuous high when you have the rate set to 9 fps or less. You have to set the frame rate for continuous high to 9. I believe the default is 10 fps and at that rate, I think focus is locked on the first frame. That restriction was lifted with a firmware update (version 3 I believe). You could see in the video how minimal the blackout was at 9 fps. I regularly track players running towards me. I'd say the in focus rate is 85%.
I only use continuous low on stationary subjects because of the excessive blackout.
The number of frames does go up, but you also catch more photos with the eyes open, limbs positioned just right, better facial expressions, etc.
I changed continuous high to 9fps and will give it a try at tomorrows basketball game.