The cat is out of the bag with the new Canon EOS 5D Mark II. Looks like a nice camera with a price point that’s under $3000. I remember paying that much for the Canon EOS D30; my how far we’ve come in just eight years! From 3MP to 21MP!
I’m interested in the camera’s low-light, high ISO performance. Will it be competitive with the D3 and D700’s excellent high ISO performance? There’s mention of weather-resistance. How does it compare with the 1D-series, which I’ve found to be built like tanks.
The 1080p video capability also looks very intriguing. Unlike the D90, the 5D Mark II offers an external stereo microphone jack; could prove handy in a pinch, or when the need to create some stunning, wide-open aperture shots. I could definitely see myself using that feature for future documentaries and films.
The 5D Mark II is due out this November. Will I get one? Maybe!
tow.com 
I don’t have any inside info, but I’d expect the environmental sealing to be on the same level as the original 5D. That is, better than the X0D series, but not as good as the 1D series.
you need to get it so that i can play with it. =P