This could be huge:

http://dpreview.com/news/1008/10080505fujifilmpd.asp

Some interesting limitations though:

In low light where there isn't enough light to allow phase detection (since the focus sensels are only receiving half the available light) or when face detection is needed, requiring the camera to focus away from the center point, the camera switches back to contrast detection AF.

But still, it's one of the most interesting camera development's I've seen in a while.

- Frank