I'm leaning towards fiction.  to turn the 5D into a 1D series body would defeat the point of the 5D (small light full frame camera). I gut feeling tells me canon has a 5D replacement in the works but they are holding off on a public release until after they release the "new and rumored to be final fix" for the 1DM3's focusing issue. It really would'nt be smart buissiness to release a new high end camera when you still have 5000+ pissed off Mark3 owners out there.