To be respectful to the Canon "die-hard" through creating a parallel topics, this is the next generation of Canon EOS 5D Mark III with 22 MB CMOS full-frame sensor, a frame rate of 6 fps, ISO 100-25,600 standard and 61 point AF system:
http://www.dpreview.com/previews/canoneos5dmarkiiiFor the pro-oriented DSLR body, this is the all new flag-ship Canon EOS 1D X with 18 MB CMOS full-frame sensor together with a frame rate of 12 fps:
http://www.dpreview.com/articles/514997 ... x-overviewOne can see the similar pattern as compared to the differences between the Nikon D800 and D4 DSLR bodies in the Canon offerings.
Good birding and photography.