Theres normally big leaks in the 24 hrs before launch so I'm guessing we wont be seeing anything big from canon soon
I dont buy the whole canon doesnt need the 1ds4 as nikon is pants argument because the d3x is a solid camera, I can understand them stretching a cycle to include a new feature or for financial reasons, but by now they have to be starting to think about the 1ds5, the 1ds4 should be pretty much ready to roll.
As for siggy glass and the foveon sensor, very fair point, fuji uses the nikon mount right? sensible choice, although I can see it would be embarassing for a major glass maker like sigma to use a nikon mount. Sigma glass can be pretty good, the problem is the fact it can also be poor and some of the build quality is abysmal. At least sigma cranking out better sensors pushes canikon to do the same!