Many photographers like me are very thankful for the amazing performance of the Canon full-frame camera 5D, and the 5D2. Compared to most full-framers, it's compact-ish and not too expensive, and the quality and low-light performance is just wonderful. Well better than any reduced-frame camera (which is pretty much any affordable DSLR).
We are approaching the time when we might expect a replacement soon.
My prayer is:
Dear Canon, please don't play the megapixel game anymore. 22 megapixels are plenty for a 35mm-sized camera, really. Instead, use your resources for even better low-light performance in the Canon 5D Mark III. If you can beat the Nikon D3s in this respect, you'll be king of the hill. Thanks for listening.
I might be a bit ahead of times. The 5D2 is two years old now. The Mark 1 lasted three years. But that's a long time in the digital market.