Then canon will release the 5DIII in Fall 2012, and that question will be answered.
With funds in hand for a 5DIII right now, I won't be waiting for it until this time
next year . I'll have enough funds for a 1D before too much longer, and I would probably spring for a new 1D model if they introduce one before spring. It kinda depends on the rumored upcomming "historic announcement".
If they piddle around and don't introduce
any new FF before spring, I'm not sure what I will do. The technology is morphing so quickly right now that I'm not even going to think about more glass, because it's hard to tell what's in the pipeline, and I don't want to be any more heavily invested in glass if the "historic announcement" is something whacky like a full frame mirrorless that doesn't work with with existing lenses.
One thing is for sure IMO - they better not piddle around too much longer, and they better come up with something really good pretty quickly (ie: "historic announcement"), or the competition is going to leave Canon milking on hind teet with Kodak.