Canon may be ready to announce the development of their megapixel camera some time late this year and perhaps release the camera the first half of 2015. Ever since the retirement of the EOS-1Ds Mk III, they are left without a professional grade, megapixel full frame camera and Nikon has been stealing their thunder with their 36MP D800 and D810 bodies ever since.
There are still discussion inside Canon as to which body style the new camera should take. My suspicion and preference is to introduce it under the EOS-1 body first and then come out with a little brother version, say the EOS-3D or a Cinema EOS version with 4K video capability. Canon needs a professional, big megapixel camera to boast about and retake the crown from Nikon. There are a few versions of sensors, including multi layer, they are working on, ranging from the high 30s to low 50MP.
Canon has been learning lessons on how to price high megapixel cameras from Nikon and Sony. Unlike the EOS-1Ds Mk III, which cost $8000 and subsequently made 'obsolete' by the much cheaper EOS-5D Mk III, the new megapixel camera will most likely be priced in the $5000 range. Before Canon can make any big megapixel camera announcement, first they have to decide when to launch the EOS-1D X Mk II and EOS-5D Mk IV cameras some time in 2015. Keep checking back for the latest news and development.