I'm very curious to see how well the AF works, and to a lesser extent the metering. If these represent a major advance over existing non-1 series Canon's (or over some people's 1 D III's , pre repairs etc.) then that would be a huge reason to upgrade to this camera. The pixels and the noise etc. don't matter much if the shot is out of focus!
My thoughts exactly.
I just hope it drives as good on the road as it looks in the showroom.