We've been hearing about the third iteration of Canon's full-frame sports DSLR for a while now, but details on its spec sheet have been sparse. However, leaked specifications of a prototype of the Canon 1D X Mark III could give us a fair picture of what to expect. According to Canon Rumors, the EOS 1D X Mark III will likely come with a 28.1MP full-frame CMOS sensor alongside a brand new image processor. The highlight of the report, however, is the news that the forthcoming shooter could boast a continuous shooting speed of 30fps.