I have it on good authority *drum roll please* that Canon are preparing a medium format camera.
Don't be so shocked.
Apparently they feel threatened by the Pentax 645D, the new Pentax 645D Mark II (coming out soon) and the massive recent price reductions in the Hasselblad HD40, not to mention the Nikon D800. It all makes perfect sense.
It's rumored to be around the 45MP mark to compete head-on with (and beat) the Pentax 645D. Canon will have a new range of glass for landscape and product usage, and they'll also sell an adapter for EF lenses. The full frame will drop megapixels down to the 18MP range so you'll have something similar to a 1DX with regular full-frame L glass (albeit in a much bigger and slower body). The focal lengths with the adapter won't be directly comparable, as the lens needs to sit further away from the body due to the bigger mirror, and the adapter shim.
The good thing about the adapter is you'll still have AF. Canon are also looking at having a manual-focus-only adapter for Schneider-Kreuznach lenses, to woo customers with existing medium-format lens investments.
This will knock Nikon out of the park, as the depth compression (that medium format and Brenizer look), dynamic range, low light performance and skin tones will be so much better.
It's why Canon were confident about combining the 1D and 1Ds lines at reduced megapixels (for the 1Ds) - they know what's coming down the pipeline for high-art landscape and studio/product shooters to fill that void.
It's just a bugger that I'll have to buy some new glass! I'll only need a couple of wide-angle primes though. Can't wait! It'll be the perfect addition to my 5DIII. Price rumored to be in the 14K range for the body.