I have a bit more information
It seems that both Canon and Nikon are aiming for very high megapixel flagship cameras near the end of 2011, somewhere in the 35-45 mpx range.
This exceeds original reports of a 32mp sensor inside the 1Ds Mark IV.
Before either of these cameras launch, I suspect both Canon & Nikon will release big megapixel cameras to come above the D700 & 5D Mark II. Think in the 28-32mp range. This would match up with some stuff I’ve been told in the past.