Canon (Finally?) Admit Hardware Fault with 1DMkIII Focusing

So it turns out the sub mirror assembly (the thing that bounces light down to the focusing ccd) doesn't like hot weather!
Cameras will need to be returned to Canon for the fix (Canon will release details of the exact process for this on a later date.)
This fault will not be present on the 1DsMkIII.

More details on the Rob Galbraith site.