The Canon EOS-1Ds Mk III camera has been discontinued for about two years and still there is no replacement for this former 'megapixel' king of the Canon professional lineup. Currently, the camera with the highest megapixel sensor belongs to Nikon and Canon's EOS-5D Mk III's sensor has surpassed the EOS-1Ds Mk III by about 1 MP.
There are Meagpixel, Super Megapixel and Medium Format prototype cameras in Canon's labs and out in field testing. Canon is in a 'low point' right now, profits are down and outlook is cloudy. Read my latest post on this topic. The only profit bright spot is in the EOS Cinema camera line and Super Telephoto lenses.
Canon needs to be decisive and announce technologically advanced products soon in order to stay ahead of the pack. The release of their megapixel camera is a start but replacement of their highly successful EOS-7D camera and EF 100-400mm f/4.5-5.6 lens should be next. Look for some development in late 2013 and early 2014 for additional news.