No surprise that Canon announced this camera now since the replacement was long overdue. just a few thoughts on this new camera.
The name: 5D mkII
I think thsi was the right choice for Canon. If they had gone for 6D or 3D or something, they would soon run out of names, and it would be confusing for the customers to place the different models in the lineup. Now everyone knows that the most recent 5D is the model just below the most recent 1D
The sensor:
Everything indicates that they have used the exact same sensor as the 1Ds mkIII, at least if you look at resolution. And why not, Nikon just matched they top model sensor in the D700 so it would be stupid of Canon to not do the same. Now both brands offer top notch IQ in a smaller and more affordable package. Also this is a good thing for Canon as they now have a much larger market for their 21MP sensor, which eventually will drive the price down as the production is ramped up.
Weather sealing:
This is a no brainer these days, even at the mid range models thanks to the competition.
HD Video:
What is this?? Buy yourself a video camera for christ sakes. Again, thanks to competition… ??
Mirror lock up:
Canon still think direct print is more important.
Do I want one: Yes! I just have to rob a bank first.
Will I buy one: No! Not worth going to jail for, and my old 5D still produces excellent pictures.