It surfaces again and again, the high megapixel DSLR Canon is said to work on. There have been other rumors about this in the past, as well as a supposed announcement date in September 2013suggested by the usually well informed Nippon Magazine.
The new big megapixel rumor also suggests an announcement date around September or October, and a general availability in the first quarter of 2014. Moreover, it is murmured there are at least two prototypes bodies out in the wild. It appears Canon is testing different sensors with different resolutions. Word is about a sensor over 50 MP, and about other working prototypes with 39MP and 47MP resolution.
Finally, it is also said that some of the technology that is expected to be featured on the Canon EOS 7D Mark II will also be sported on the mighty big megapixel DSLR.
Hard to say what is going on with the big megapixel DSLR we suppose Canon is developing. I have always been told that it will be a 47MP sensor and that it will come in an EOS-1 shaped body, but it is more than plausible that Canon is testing out various sensor before taking the decision which one to use on such a camera.