To add my 2-cents to the focus speed and focus point debate I will refer to the 2 images I've posted links to below.
Having multiple focus points is essential. It is, especially in sports photography, not an option to recompose. Take the first image of a car, the focus point is set to the middle-right point so as to keep the front of the car in focus. In the soccer example I had the farthest-right point selected as I was shooting in portrait and wanted to be certain the subjects head was always in focus.
Focus was tracking on the front-left (camera-right) headlight. Focus was tracking on this boys face.
In sports shooting you need quick, accurate AF and high FPS. These go hand in hand, as we've discovered with the K10D. I, personally, would like to see at least 40D-grade AF, hopefully nearing D300. 11 AF points is good, some more would be better, but mainly accuracy and the ability to predict what is happening.
The prediction side of things Pentax simply can not do. I'm now finding myself shooting more and more sports and finding the limitations of the K10D AF system regularly. For examples like the one posted below the Pentax simply couldn't handle it, yet I shot the same corner with the same lens (both 50-500's) on a 40D and it was spot on every time.
Notice how the focus is on the base of the windscreen? The camera focussed on the front bumper, but because it couldn't predict where it was going to be it fouled up the focus.
This is most certainly a selling point. Not just for me, but a lot of others. There is a massive market here.