I have never been one… to speculate about what equipment may or may not be forthcoming from any manufacturers. However, I really think that Nikon have stolen a bit of a march on Canon with their latest Nikon D3.
There are several features that I really like, and wish that Canon had (or will) include in the next generation of the EOS1D. First and foremost the one thing that I have disliked since the EOS1D MkII was the addition of the SD card slot, as well as the CF card. The Nikon solution is far more elegant, using dual CF cards. Whilst I realise that the SD card standard will enable the SD card slot to be used for far more things than the current CF Card format will permit, it is a pain in the arse when it comes to it’s primary function, taking pictures.