We’ve heard previously about a 46mp image sensor that exists and is in testing. We’re now told that multiple large megapixel sensors exist, and one that is sure to reach market is a 39.3mp sensor.
There is also a suggestion that we will see DIGIC VI processors before the larger megapixel camera(s) reach the market in late 2013 or early 2014.
This comes from a new source, so take it with a grain of salt.
I’ve also heard from two different people that the earthquake that happened in Japan is still affecting manufacturing and development of new products at Canon, though Canon would never officially admit to such a thing.
As far as new stuff goes, we should see the APS-C segment and lenses addressed before a large megapixel camera arrives on the scene.