The 1Ds Mark IV is probable for Photokina 2010 at the present. I have also heard springtime.
32mp Full Frame (I have also heard 38mp)
Dual DIGIC IV (no one is making a peep about DIGIC V)
New Video Features (Natural evolution)
ISO Range 100-6400 (no word on boost)
Same AF System as 1D4
Same body as 1D4
Nothing extraordinary here. Although, the sensor spec of 32mp comes from a pretty reliable source.