I’m told it’s possible we’ll see an “in development” announcement sometime in 2012 for a large megapixel DSLR from Canon. I have heard both 39mp and 46mp prototype(s) are out in the field.
In development announcements seem to be getting more popular with Canon and their high end products. As we’ve seen from the EOS-1D C and EF 200-400 f/4L IS 1.4X, it seems to allow them a lot of latitude in testing and helps with public relations. It also stops sites like this speculating on arrival of new products. :)